Look at the mess the boys made! You _______ have taught them how to behave themselves.
#87866
A
must
B
may
C
can
D
should
推荐题目
 It’s high time we _______ effective _______to improve your working conditions.
#87269
A
take; means
B
made; measures
C
took; measures
D
do; actions
Mr. Blake __________my letter, otherwise he would have replied by now.
#87901
A
will not have received
B
needn’t have received
C
shouldn’t have received
D
couldn’t have received