Technology is another great force for change. In part, technology has caused the population explosion; many of us won't now be alive if it weren't for advances in health, 【M1】 ______

A.
B.
In
C.
【M1】


【参考答案】

won't→wouldn't
won't→wouldn't 解析：本句是一个虚拟条件句．谓语动词要用虚拟语气，所......

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