Experiments of this kind ___in both the U．S and Europe well before the Second World War
#100340
A
had conducted
B
have conducted
C
have been conducted
D
had been conducted
推荐题目
--- Is there any possible way to help them get rid of such a bad habit?--- To tell the truth, it’s very hard. But we on this problem trying to improve the situation.
#104873
A
worked
B
had worked
C
are working
D
had been working
He ______ at the meeting, but his heart attack prevented him.
#104277
A
will speak
B
is going to speak
C
had to speak
D
was going to speak
He ________ to the lab than he set out to do the experiment.
#104294
A
has no sooner got
B
no sooner got
C
will no sooner get
D
had no sooner got
____________better ways for digging tunnels__________, the first railway tunnel under the River Thames was dug in 1884.
#100801
A
As , developing
B
With, developed
C
As , were developed
D
With, development
I_______ your advice, otherwise I couldn’t have carried out the plan on time.
#104825
A
take
B
have taken
C
took
D
had taken