单项选择题

Most electronic devices of this kind, ______ manufactured for such purposes, are tightly packed.

A. that are
B. as are
C. which is
D. it is
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单项选择题
Unless all the members agree to ______ to the plan, there may be further development in the course of action.
A. tumble
B. stick
C. come
D. adjust
单项选择题
______ he was aware of the real meaning of life.
A. That was from that book
B. It was that book which
C. It was from that book that
D. It was that book that
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