【題目】—Are the new machine working?

—Yes. Three million tons of coal________exploited every year in the city.

A．is

B．are

C．has

D．have

【答案】B

【解析】句中coal“煤”為不可數(shù)名詞，被three million tons of限定，在句中作主語。這時(shí)，句子謂語動詞的數(shù)應(yīng)與of短語中表示“數(shù)量”的名詞“tons”一致，故要選復(fù)數(shù)形式的謂語動詞。根據(jù)句子意思，選項(xiàng)部分為一般現(xiàn)在時(shí)的被動結(jié)構(gòu)，選項(xiàng)C和D都是主動語態(tài)結(jié)構(gòu)。

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