It’ s suggested by experts that teenagers ____at least 30 minutes exercising, five times a week.
#87174
A
spend
B
to spend
C
spent
D
have spent
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The rule demands that everyone ______ quiet in the school library.
#86874
A
keeps
B
keep
C
will keep
D
should be kept
Thank you so much! But for your text message, I ____ home without my ID card this morning.
#87430
A
would have left
B
would leave
C
had left
D
left
They________have arrived at lunchtime but their flight was delayed.(2011·全国 )
#86368
A
will
B
can
C
must
D
should
Watch out for these animals! They could be terrified ______ a sudden loud noise．
#87225
A
being there
B
should there be
C
there was
D
there have been
---Why didn’t you reared him of the possible danger?---But what otherwise? He never listens to me.
#86877
A
could I do
B
could I have done
C
should I do
D
must I have done