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
Mr. Black _______Shanghai in a few days. Do you know when the earliest plane _______ on Sunday.
#100720
A
leaves; takes off
B
is leaving; takes off
C
is leaving; is taking off
D
leaves; is taking off
The plan _____ by the Chinese government ____ rejuvenating the nation by relying on science.
#102795
A
put forward, aimed at
B
was put forward, aiming at
C
put forward, was aimed at
D
put forward, aiming at
Mike his wedding for a whole month and hopefully everything will be ready tomorrow.
#103203
A
prepares
B
is preparing
C
has prepared
D
has been preparing
Nowadays it is obvious that the Internet _______ our life rapidly.
#101864
A
would change
B
changed
C
had changed
D
is changing
When I got on the bus,I_____I had left my wallet at home.
#102653
A
was realizing
B
realized
C
have realized
D
would realize