【題目】When he was 20 years old, he __________ doctor in the village.

A. become

B. turned

C. grown

D. changed

【答案】B

【解析】考查系動(dòng)詞的用法。句意：他20歲時(shí)，成了村里的醫(yī)生。doctor前無冠詞，用turn。

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