单项选择题

My pain （）apparent the moment I walked into the room, for the first man I met asked sympathetically: "Are you feeling all right"

A. must be
B. must have been
C. had been
D. had to be

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单项选择题
Apart from caring for her children, she has to take on such heavy （） housework as carrying water and firewood.

A. time-consumed
B. timely-consumed
C. time-consuming
D. timely-consuming
单项选择题
（31）（）

A. how
B. where
C. when
D. whether
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