【題目】The brave doctors and nurses volunteer to go to the front line whenever they ______ (need).

【答案】are needed

【解析】

句意:這些勇敢的醫(yī)生和護士在需要的時候自愿奔赴前線。

need需要,是一個動詞。根據(jù)句意可知,whenever引導的從句中,主語they和動詞need構(gòu)成被動關(guān)系,應(yīng)用被動語態(tài)。這句話使用的是一般現(xiàn)在時,故答案為are needed

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