单项选择题

______ plastics, the machine is light in weight.

A. To make of
B. To be made of
C. Having made of
D. Made of
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The trouble with owning a foreign car is that ______ parts are so expensive.
A. extra
B. separate
C. spare
D. reserve
单项选择题
My train arrives in Shenyang at seven o'clock tomorrow. The plane I would like to take from there ______ by then.
A. would leave
B. will have left
C. has left
D. had left
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