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
Because the shop _______, the T-shirts are sold at half price.
#104568
A
has closed down
B
closed down
C
is closing down
D
had closed down
—Has your father returned from Africa yet?—Yes,but he _______ here for only three days before his company sent him to Australia.
#104072
A
was
B
has been
C
will be
D
would be
Have a good look round the room to make sure you ______ everything.
#101047
A
had packed
B
pack
C
have packed
D
are packing
—Do you think we should accept that offer?—Yes, we should, for we _________ such bad luck up till now, and time _________ out.
#104592
A
have had; is running
B
had; is running
C
have; has been run
D
have had; has been run
Many students apply for a position at that company, but only a few _____.
#100909
A
are being accepted
B
are accepted
C
have accepted
D
accept