New technology ______ to make sure that the cars, taxis, buses and trains we use ______ the air.
#104707
A
is used; not to pollute
B
has used; is not polluted
C
is being used; do not pollute
D
has been used; to pollute
推荐题目
---- If he_____ , he ______ that food. ---- Luckily he was sent to the hospital immediately.
#102860
A
was warned; would not take
B
had been warned; would not have taken
C
would be warned; had not taken
D
would have been warned; had not taken
--- Who’s the man over there? --- It’s Jack. --- Oh? ______ in Italy.
#104091
A
I think he’s
B
I’ve thought he’s been
C
I thought he was
D
I’d thought he’d been
--- Joan, what_________in your hand? --- Look! It's a birthday gift for my grandmother.
#102660
A
had you held
B
are you holding
C
do you hold
D
will you hold
Jim talked for about half an hour yesterday.Never＿＿＿＿＿ him talk so much.
#104644
A
I heard
B
did I hear
C
I had heard
D
had I heard
Is honesty the best policy? We _ that it is when we are little.
#101432
A
will teach
B
teach
C
are taught
D
will be taught