题目内容
【题目】Jenny's Chinese _______ a lot since she _______ to China two years ago.
A.improved; came
B.has improved; has come
C.improved; has come
D.has improved; came
【答案】D
【解析】考查since引导的时间状语从句, 从句常用一般过去时,主句常用现在完成时,故选D。
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