单项选择题

To obtain a satisfactory result, one must apply two ______ of paint on a clean surface.

A. coats
B. levels
C. times
D. courses
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单项选择题
If only I ______ what you wanted!
A. knew
B. know
C. had known
D. have known
单项选择题
Individual lines of the poem were very beautiful, but I didn't see how the lines fit together. To me, the poem wasn't ______.
A. inherent
B. coherent
C. logical
D. corporate
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