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(2007·西城中考题)

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:这个句子比较复杂。句子前面的动词不定式作目的状语,it作句子的形式主语,因此在形容词necessary之后应该使用动词不定式作真正的主语。从选项可以看得出来,这里作主语的不定式是个复合不定式结构。动词不定式的复合结构应该是“for sb. to do sth.”,因sb.在句子中作介词for的宾语,故应该使用名词或代词宾格,故正确答案为D


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