B
省略了we are
完整的应该是when we are exposed to stress
或者说.
expose在这里应该用被动语态
When ____ stress,we react both chemically and physically.[A.exposing to B.exposed to]
When ____ stress,we react both chemically and physically.[A.exposing to B.exposed to]
And reason,please.Thanks.
And reason,please.Thanks.
英语人气：807 ℃时间：2020-05-01 08:35:26
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