Betty____in this school since she came to Shanghai last year.

Betty____in this school since she came to Shanghai last year.

题目
Betty____in this school since she came to Shanghai last year.
A.studies B.studied C.will study D.has studied
望好心人能顺便说明解题原因,
答案
D.has studied,因为 since ...与现在完成时连用
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