单项选择题

Help others whenever you can () you will earn respect from others without difficulty.

A. and
B. or
C. unless
D. but

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单项选择题
Walk another block and cross the traffic lights, you will see the museum right the left.()

A. by
B. in
C. on
D. for
单项选择题
Had he worked harder, be ()the exams.

A. must have got through
B. would have got through
C. would get through
D. could get through
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