单项选择题

He was only in （）at that time.

A.his 30’s
B.the 30’s
C.his thirties
D.the thirties

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单项选择题

I suppose she is not serious，（）？

A.do I
B.don’t I
C.isn’t she
D.is she

单项选择题

It was in this house （）the important meeting in history was held.

A.where
B.that
C.which
D.in which