Air pollution, together with littering, ____ many problems in our large industrial cities today.
#96011
A
causes
B
cause
C
caused
D
causing
推荐题目
Canada is a country _____many different nationalities as well as one with foreign immigrants _____ the majority of its population.
#89796
A
making up of; made up
B
consisting of; making up
C
made up of; consists of
D
consisted of; made up
John reached out in a hurry , the door .
#96509
A
leaving ,unlocking
B
leaving , unlocked
C
left , unlocked
D
to leave , unlocking
They would not allow him _______ across the enemy line.
#95366
A
to risk going
B
risking to going
C
for risk to go
D
risk going
Lucy has a great sense of humour and always keeps her colleagues ________ with her stories.
#96206
A
amused
B
amusing
C
to amuse
D
to be amused
---- Is Bob still performing?---- I'm afraid not. He is said________ the stage already as he has become an official.
#98540
A
to have left
B
to leave
C
to have been left
D
to be left