单项选择题

However, at times this balance in nature is_____, resulting in a number of possibly unforeseen effects.

A．troubled
B．disturbed
C．confused
D．puzzled
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单项选择题
Research findings show we spend about two. hours dreaming every night, no matter what we ______during the day.
A．should have done
B．would have done
C．may have done
D．must have done
单项选择题
_____it left to me to decide, I would never hesitate to choose the former.
A．If
B．Were
C．Had
D．Should
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