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 fight"

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

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单项选择题
______ evidence that language-acquiring ability must be stimulated.
A. It being
B. It is
C. There is
D. There being
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