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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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
单项选择题
If it ______ Professor Russel standing up for him, he would have had to leave.
A. hasn’t been for
B. hadn’t been for
C. was for
D. were for
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