单项选择题

A series of lectures on radio engineering ______ scheduled.

A. have been
B. has been
C. are

D. had been
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单项选择题
It is imperative that students ______ their term papers on time.
A. have to hand in


B. handed in
C. hand in



D. would hand in
单项选择题
______, Hong Kong serves as a gateway into and out of Taiwan.
A. Strategically located

B. It is located strategically
C. Where strategically located
D. Because located strategically
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