单项选择题

He was seen ______ the room ten minutes ago.

A. enter
B. to enter
C. be entering
D. having entered
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单项选择题
When water ______, it will be changed into vapour.
A. is heated
B. will be heated
C. will heat
D. has heated
单项选择题
It ______ that the football match ______ put off because of the rain.
A. suggested; would be
B. suggested; should be
C. is suggested; shall be
D. was suggested; be
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