試比較(和本題比較：It is hard 后沒有 is)：

It’s hard to do good all one’s life and never doanything bad. 要一輩子做好事不做壞事是困難的。

請做以下類似試題：

1. a. ____ is difficult to persuade her.

b. ____ is difficult is to persuade her.

A. It, It                     B. What, What           C. It, What                D. What, It

2. a. ____ is useful to drink more milk.

b. ____ is useful is to drink more milk.

A. It, It                     B. What, What           C. It, What                D. What, It

3. a. ____ is interesting to watch children play games.

b. ____ is interesting is to watch children play games.

A. It, It                     B. What, What           C. It, What                D. What, It

4. a. ____ is dangerous to play with fire.

b. ____ is dangerous is to play with fire.

A. It, It                     B. What, What           C. It, What                D. What, It

答案：1. C 2. C 3. C 4. C

8. 這個(gè)問題你會(huì)回答嗎

—What made you so worried?

—______

A. Because I lost my wallet.                   

B. As I lost my wallet.

C. Losing my wallet.                               

D. Lost my wallet.

此題應(yīng)選C。容易誤選A。

分析：由于問句中的疑問詞what在句中用作主語, 所以其相應(yīng)的答語也應(yīng)是能用作主語的成分。答案A, B錯(cuò)誤, 因?yàn)樗鼈兪窃�因狀語; 答案D錯(cuò)誤, 因?yàn)檫^去分詞不用作主語。

選項(xiàng)C正確, 因?yàn)閯?dòng)名詞可用作主語。答句其實(shí)是一個(gè)省略句, 補(bǔ)完整為：Losing my wallet made me so worried. 在回答特殊疑問句時(shí)，要特別注意其疑問詞的含義以及它在句中的句法功能；反過來, 要是根據(jù)答語選擇疑問詞, 也要注意其對應(yīng)關(guān)系：

1. —_____ does he come to see you?

—Once a week.

A. How long              B. How often             C. How soon             D. How much

2. —How long has he lived here?

—____ he was a child.

A. After                    B. Before                  C. Since                    D. When

3. —_____ is the capital of China?

—Beijing is.

A. Where                  B. What                    C. Which                  D. How

答案：1. B 2. C 3. B

9. 是 such...as 還是 such...that

He’s such a good teacher ______ we all love and respect.

A. that                     B. as                        C. who                     D. so

此題應(yīng)選B。容易誤選A。主是是受句子意思的影響以及受 such...that 這一固定句式的影響。

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