单项选择题

Our concert turned out to be a great success, _________they had never expected.()

A.what
B.that
C.when
D.which

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现在总结一下，以确保双方都彼此了解。

单项选择题

August 15,1999 is one of the greatest days in his life_________ he was accepted by a university.()

A.while
B.that
C.which
D.when