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
(2013·绵阳二诊)—I happened to meet Lily yesterday.—Lucky dog！You ________each other for two years.
#99151
A
haven’t seen
B
hadn’t seen
C
didn’t see
D
don’t see
There standing _______ the hawthorn tree that stands for their love while _______ are the lovers.
#103128
A
is; going
B
is; gone
C
are; going
D
are; gone
— That must have been a long trip. — Yeah, it _____ us a whole week to get there.
#100042
A
takes
B
had taken
C
took
D
was taking
---- Look! Everything here is under construction. ---- What’s the pretty small house that ____________ for?
#101031
A
is being built
B
has been built
C
is built
D
is building
There is too much rain these days, isn’t there ? —Yes, it ___ for a week.
#101182
A
has been raining
B
had been raining
C
was raining
D
rained