【題目】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引導(dǎo)的時間狀語從句, 從句常用一般過去時,主句常用現(xiàn)在完成時,故選D。

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