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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