单项选择题

It is a process during （） the body releases water to cool the skin.

A. when
B. which
C. where
D. that

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单项选择题
Mary's parents are worried about Mary because no one was aware（） she had gone.

A. of where
B. where that
C. the place
D. where of
单项选择题
Because of the complexity of our modern machine, we need our workers（）

A. to train special
B. specified in training
C. to have specified training
D. training specially
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