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

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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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