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(2007·西城中考題)

To keep us healthy, it is necessary ________ take some exercise for some time every day.

[  ]

A.for we to
B.to for we
C.for us
D.for us to

答案:D
解析:

解析:這個句子比較復雜。句子前面的動詞不定式作目的狀語,it作句子的形式主語,因此在形容詞necessary之后應該使用動詞不定式作真正的主語。從選項可以看得出來,這里作主語的不定式是個復合不定式結構。動詞不定式的復合結構應該是“for sb. to do sth.”,因sb.在句子中作介詞for的賓語,故應該使用名詞或代詞賓格,故正確答案為D。


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