【題目】The world is racing against the clock to produce COVID-19 vaccines (疫苗) to help stop the disease, but few people can tell the exact time. ________?

A.can theyB.do theyC.can’t they

【答案】A

【解析】

句意：世界正與時間賽跑，致力于產(chǎn)生新冠病毒疫苗來阻止病毒蔓延，但是幾乎沒有人可以說出確切時間，是嗎？

考查反意疑問句。can they是嗎？含有情態(tài)動詞的肯定形式；do they是嗎？含有助動詞的肯定形式；can’t they是嗎？含有情態(tài)動詞的否定形式。反意疑問句遵循“前肯后否，前否后肯”的原則，根據(jù)but后的句子，few表示“幾乎沒有”，含有否定含義，后面部分需要用肯定形式，前面部分含有情態(tài)動詞can，所以之后也需要用can。故選A。

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