It takes a couple of years of regular driving before you become______at it.A、def

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问题 It takes a couple of years of regular driving before you become______at it.

选项 A、deficient
B、proficient
C、sufficient
D、efficient

答案 B

解析 proficient表示“熟练的，精通的”，后可接in／at，如：She’s proficient in French．她精通法语。

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