单选题
22.
It is absolutely necessary for us to have sufficient oxygen if we______to go on living.
A、
are
B、
were
C、
had
D、
having
【正确答案】
A
【答案解析】
if we are to go on living=if we want to go on living“如果我们想要继续生存的话”。本题不属于纯假设的虚拟条件句。
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