单项选择题

Criticism and self-criticism is necessary（）it helps us to correct our mistakes.

A. in that
B. in which
C. unless
D. until

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单项选择题
The kids lay face down on the beach, their backs（）to the sun.

A. exposing
B. were exposing
C. exposed
D. having exposed
单项选择题
The new power station is reported（）within three years.

A. to complete
B. having been completed
C. to have completed
D. to have been completed
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