单项选择题

The thief tried to open the locked door but()

A.in no way
B.in vain
C.without effect
D.at a loss

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单项选择题
()you decide to take up, you should try to make it a success.

A.Whatever
B.Unless
C.Whenever
D.If only

单项选择题
The Joint Declaration on the future of Hong Kong, which we have just signed()our two governments, is a landmark in the history of international diplomacy.

A.in behalf of
B.on behalf of
C.represented
D.represent

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