It isn't quite _______ that he will be present at themeeting.
A、sure
B、bright
C、certain
D、 exact
第1题:
There must be something wrong with my computer,()there?
A. mustn't
B. needn't
C. isn't
第2题:
He seldom does his homework at school on weekdays,( )he?
A. doesn't
B. isn't
C. does
D. is
第3题:
第4题:
A、prior to
B、in front of
C、in advance
D、prior
第5题: