I’ll never forget the days I spent in Beijing last year.A. whenB. on whichC. in whichD. t

I’ll never forget the days I spent in Beijing last year.
A. when
B. on which
C. in which
D. that

A. whenB. on whichC. in which(答案→)D. that解析：可联系答.案.网客服索取。

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