If we ___________some measures, we might have prevented the environmental pollution．
#87466
A
take
B
had taken
C
took
D
have taken
推荐题目
--- Who ______ it be that is singing in the next room?--- It _______ be Lucy, but I am not sure.
#86933
A
can ; may
B
may ; can
C
can; must
D
must; may
.Mary is so wet. She _______ in the rain.
#88015
A
must be caught
B
must have been caught
C
should have been caught
D
can have been caught
Our English teacher suggested we ________ English as much as possible in class.
#87550
A
must speak
B
may speak
C
spoke
D
should speak
We were delayed at the airport．Otherwise，we here by lunch．
#86444
A
must have been
B
could be
C
should be
D
would have been