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
______ your letter, I am pleased to inform you that your plans are quite acceptable to us.
A．Supposing
B．Concerning
C．Providing
D．Granting
单项选择题
Scientists are seeking ways to ______ cancer.
A．conquer
B．defeat
C．overcome
D．subdue
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