Experiments of this kind ___in both the U.S and Europe well before the Second World War.
#102411
A
had conducted
B
have conducted
C
have been conducted
D
had been conducted
推荐题目
(2013·山东，27)—Oh no! We're too late.The train________.— That's OK.We'll catch the next train to London.
#99732
A
was leaving
B
had left
C
has left
D
has been leaving
—What were you up to when she dropped in?—I _________ for a while and __________ some reading.
#104505
A
was playing; was going to do
B
played; did
C
had played; was going to do
D
had played; did
----when are you going off for your holiday? ----My plane ______ at 9:20, so I must be at the airport by 8:20.
#99845
A
took off
B
has taken off
C
is taking off
D
would take off
According a recent survey, if the factory closes, a lot of people _______ their jobs.
#101220
A
are going to lose
B
will lose
C
may lose
D
are about to lose
The twins look alike,but they _____in character.
#101202
A
different
B
differ
C
distinguish
D
transform