【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(rèn)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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