单项选择题

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

A．have found
B．will be finding
C．are finding
D．will have found
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单项选择题
Criticism and self - criticism is necessary ______ it helps us to find and correct our mistakes.
A．by that
B．in that
C．on that
D．at that
单项选择题
With such poor ______ he really needs glasses.
A．vision
B．view
C．sense
D．scene
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