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27 Trees ＿＿＿ in spring.
A. plant
B. were planted
C. should be planted
D. should plant
［答案］ C.
［析］ should用于一般现在时态中表示应该，而此句又是被动语态。
28 - Where's your father?
- He ＿＿＿ to Paris.
A. go
B. goes
C. went
D. has gone
［答案］ D.
［析］ has gone 是已去某处了，不在这里了。所以强调过去的动作影响到现在。
29 - Must I finish my homework in class now?
- No, you ＿＿＿ . You can do it at home.
A. mustn't
B. may not
C. needn't
D. can
［答案］ C.
［析］ needn't表示没有必要一定要这样做。由must提问，肯定句用must，否定句用needn't.
30 Thank you very much for ＿＿＿ your book ＿＿＿ me.
A. lending, to
B. lent, to
C. borrow, from
D. borrowing,from
［答案］ A.
［析］ for是介词，要用动名词作介词宾语。
31 The Great Green Wall will stop the wind from ＿＿＿ the earth away.
A. blowing
B. blow
C. blows
D. to blow
［答案］ A.
［析］ stop…from doing something. 阻止某人或某物作某事。
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