问题
选择题
I really wonder____ he has posted me many parcels_____ we didn't work together.
A．how ,after
B．why, when
C．when, before
D．why, since
答案
答案：D
考查连词。我真的很想知道自从并不在一起工作后，他寄给我许多包裹。since引导的从句中用过去时，主句用现在完成时。
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