The scientist __________ the experiment for half a year, but he _______ yet.
#102041
A
made; didn’t succeed
B
made; hasn’t succeeded
C
was making; didn’t succeed
D
has been making; hasn’t succeeded
推荐题目
--- Look at the black clouds. It ______ soon. --- Sure. If only we ______ out.
#104263
A
is raining; didn’t come
B
is to rain; won’t start
C
will rain; haven’t started
D
is going to rain; hadn’t come
Rain is pouring down from the sky without any sign of stopping．Farmers begin to worry about their crops since it _____ as long as 24 hours．
#103320
A
would rain
B
had rained
C
was raining
D
has been raining
For some time the expert __________ people of the health risks caused by passive smoking. He says he won't stop until all the smokers around him decide to quit smoking.
#99539
A
is warned
B
is warning
C
has been warning
D
has been warned
—I’m sorry, but the manager isn’t here yet. Shall I have him call you when he comes back?—No, I’ll call him later. If I call again in half an hour, do you think he ?
#100631
A
arrives
B
has arrived
C
will arrive
D
will have arrived