Experiments of this kind ___in both the U．S and Europe well before the Second World War．
#100251
A
had conducted
B
have conducted
C
have been conducted
D
had been conducted
推荐题目
By now, more than 100 photos ________ back to the earth by Chang’e-3.
#99862
A
had been sent
B
has been sent
C
have been sent
D
will be sent
Our teacher said to us that the earth _________ around the sun.
#100780
A
travelled
B
travels
C
is traveling
D
was traveling
----I’m sorry, but making a telephone call is not allowed in the meeting-room. ----Oh, I_____that, Sorry, I don’t do that again.
#104824
A
don’t know
B
didn’t know
C
won’t know
D
haven’t known
China sent up Shenzhou Ⅸ manned spaceship into space successfully, which shows science and technology ______ rapidly in China.
#100611
A
have been developing
B
have developed
C
has been developed
D
is developing
After school we went to the reading-room to do some reading, only to be told that it .
#99303
A
was decorated
B
had decorated
C
had been decorating
D
was being decorated