Experiments of this kind in both the U．S．and Europe well before the Second World War．
#102432
A
have conducted
B
have been conducted
C
had conducted
D
had been conducted
推荐题目
—I'm sure Andrew will win the first prize in the final.—I think so.He ________ for it for months.
#99752
A
is preparing
B
was preparing
C
had been preparing
D
has been preparing
—Well, that was really a good meal. I _______ you were a really good cook.—Thank you.
#104832
A
didn’t know
B
don’t know
C
haven’t know
D
hadn’t known
The recent stories in this magazine, _____ one of yours, have been ____ in the list of the best ones.
#100848
A
include; include
B
including; including
C
including; included
D
included; included
That is the first time that I _____ at the meeting.
#100285
A
had spoken
B
have spoken
C
am present
D
was present
Public attention at the moment is ______ on the problem of how to create opportunities for the laid-off workers.
#103481
A
focused
B
paid
C
attracted
D
concerned