单项选择题

______ there is little we can do to change the reality, we can not be totally at the mercy of the harsh environment.

[A] Since
[B] When
[C] Unless
[D] While
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单项选择题
Mary will not be able to come to the birthday party as she is ______ with a cold.
[A] laid aside
[B] laid by
[C] laid up
[D] laid down
单项选择题
______ with the hardship confronted with by the Red Army, the difficulty you're facing is insignificant.
[A] When compared
[B] Compare
[C] While comparing
[D] Comparing
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