单项选择题

______ ,I should ask them some questions.

A．Should they come to us
B．If they come to us
C．Were they come to us
D．Had they come to us
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单项选择题
Car 17 won the race. Yes, but its driver came close to ______ killed.
A．being
B．having been
C．be
D．have been
单项选择题
______ we need air and water, so do we need criticism and self-criticism.
A．Even though
B．So long as
C．Just as
D．Now that
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