单项选择题

A safety analysis ____________the target as a potential danger. Unfortunately, it was never done.

A．would identify
B．will identify
C．would have identified
D．will have identified
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单项选择题
Generally speaking, the bird flying (across) our path is observed; and (the one) staying on the tree near (at hand) is passed by without any notice (taking) of it.
A．across
B．the one
C．at hand
D．taking
单项选择题
When traveling , you are advised to take travellers' checks, which provide a secure ___________to carrying your money in cash.
A．substitute
B．selection
C．preference
D．alternative
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