问题
o has returned from the UK recently. He ______at Cambridge for four years, during which we ______ with each other on theInternet.
A:has studied; has communicated
B:had studied; communicated
C:studied; had communicated
D:studied; communicated
B:had studied; communicated
C:studied; had communicated
D:studied; communicated
正确答案是：
同类题型
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