单项选择题

By the end of this semester, we surely ______ a satisfactory solution to the problem.

A．have found
B．will find
C．will have found
D．are finding
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单项选择题
Mary never tells anyone else what she does for a ______ .
A．job
B．work
C．living
D．life
单项选择题
Poor ______ he is, he remains honest and kind.
A．as
B．however
C．because
D．although
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