Experiments of this kind _______in both the U.S. and Europe well before the Second World War started.
#100664
A
have conducted
B
have been conducted
C
had conducted
D
had been conducted
推荐题目
Hi, Mike. I’ve to borrow your car this afternoon mine _______ in the garage.
#99388
A
is repairing
B
is being repaired
C
has repaired
D
has been repaired
--What made your father throw up last night?--I think the large quantities of wine __________.
#104806
A
was
B
might
C
make
D
did
- Ann is in hospital. - Oh, really? I _______ know. I _______ go and visit her.
#101618
A
didn’t; am going to
B
didn’t; will
C
don’t; would
D
don’t will
-You were not in when I came over to your house. -Oh, I ____________ for a friend from England at the airport.
#99389
A
was waiting
B
had waited
C
am waiting
D
have waited
All the students in this school are required to ________ at least two lectures on how to study every month.
#101199
A
attend
B
take part in
C
join in
D
join