(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(fù)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(yīng)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(fù)合不定式結(jié)構(gòu)。動詞不定式的復(fù)合結(jié)構(gòu)應(yīng)該是“for sb. to do sth.”,因sb.在句子中作介詞for的賓語,故應(yīng)該使用名詞或代詞賓格,故正確答案為D


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