单选题
24.
Without air or water, there______no life on earth.
A、
is
B、
will be
C、
has been
D、
would be
【正确答案】
D
【答案解析】
介词without引导的短语在一定的上下文中可以起一个虚拟条件从句的作用，相当于if there were no…或(以人作主语)if．．had not…，如：I should have been badly offwithout your friendship．
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