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 Mostofthetimeweareunawareofwhat

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 Mostofthetimeweareunawareofwhat

 Most of the time we are unaware of what ______ in our bodies; usually it is only when we get sick or feel pain that we notice.

A. happen                   B. happens                 C. is happening          D. has happened

【回答】

C

知识点:现在进行时及其被动式

题型:选择题

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