单项选择题

Difficult as it is, English study is in the long run ______ to a learner in his or her career development.

A．advantageous
B．rewarding
C．profitable
D．earning
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单项选择题
People's confidence in Blair was greatly ______ by his wife's misbehavior.
A．sapped
B．cherished
C．sabotaged
D．confirmed
单项选择题
The private detective, having received new information from a confidential source, narrowed down the ______ of his enquiry into the case.
A．aspect
B．sphere
C．dimension
D．scope
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