【題目】這段時期我們出門前必須要戴口罩。

Masks________ ________ ________before we go out during this period.

【答案】must be worn

【解析】

根據(jù)漢語與英語對照可知,此空的意思是必須要戴的意思,根據(jù)句子結(jié)構(gòu)可知,此句是含有情態(tài)動詞的被動語態(tài),結(jié)構(gòu)為must be done,結(jié)合句意可知,故答案為must be worn

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