单项选择题

All I request of you is that you ________ punctual.

A. are
B. (should) be
C. will be
D. were
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单项选择题
We look at all the types of fences and gates and give tips _____ building them.
A. of
B. on
C. to
D. for
单项选择题
I find it difficult to ______ a conclusion without further analysis.
A. draw
B. come
C. arrive
D. lead
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