【題目】Please call me back if you_______ free tomorrow.

A. are B. will be C. is D. is going to be

【答案】A

【解析】

句意如果你明天有時間請給我回電話。根據(jù)句子中的if可知,這是if引導的條件狀語從句,在條件狀語分為三種形式,即主將從現(xiàn)(主句是將來時,從句用一般現(xiàn)在時,主情從現(xiàn)(主句含情態(tài)動詞,從句用一般現(xiàn)在時,主祈(主句是祈使句,從句用一般現(xiàn)在時從現(xiàn);這里主句是祈使句,故從句要用一般現(xiàn)在時,故選A。

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