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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单项选择题
All things ______ , the planned trip will have to be called off.
A．considered
B．be considered
C．considering
D．having considered
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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