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關閉窗口 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. 這個問題你會回答嗎
—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, 所以其相應的答語也應是能用作主語的成分。答案A, B錯誤, 因為它們是原因狀語; 答案D錯誤, 因為過去分詞不用作主語。
選項C正確, 因為動名詞可用作主語。答句其實是一個省略句, 補完整為：Losing my wallet made me so worried. 在回答特殊疑問句時，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, 要是根據答語選擇疑問詞, 也要注意其對應關系：
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
—
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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