问题

Was it 80 years before Christopher Columbus crossed the Atlantic ______ Zheng He hadsailed to East Africa?
A:when
B:that
C:after
D:since
B:that
C:after
D:since
正确答案是:
同类题型
le now teaches French in afamous domestic university, who _______ in Paris for 6 years
He lost his favorite watch, _________ made him very sad.
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Progress so far has been very good,we are sure that the project will be completed on time[ ]