单项选择题

The doctor said this medicine is ______ against lung cancer.

A．efficient
B．effective
C．expensive
D．effort
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单项选择题
You'd better ______ your homework by the time I arrived.
A．finished
B．finish
C．had finished
D．finishing
单项选择题
The pair of bracelets were ______ from my grandmother.
A．handed in
B．handed out
C．handed down
D．handed over
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