【題目】I think it is necessary for us _________ exercise every day.
A.take
B.to take
C.taking
D.taken

【答案】B
【解析】句意:我認為對我們來說每天鍛煉是必要的。根據(jù)句型It is necessary for sb to do sth對于某人來說做某事是必要的,故此處用動詞不定式to take,故選B。

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