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
Dad had to cycle to work this morning because his car _______ at the garage.
#102788
A
was repaired
B
was repairing
C
was being repaired
D
would repair
You’d better not phone the manager between 7 and 8 tomorrow evening; he ________ an important meeting then.
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A
will have
B
would have
C
will be having
D
will have had
---- Tom, did Mr. Li join you in your discussion? ---- No, he _____, but he happened to have fallen ill.
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A
would like to
B
will
C
was to have
D
was going to join
. Tom as well as his classmates __________ a song when the teacher came into the classroom.
#103734
A
are singing
B
were singing
C
is singing
D
was singing
Half the world’s population ______ water shortages within 15 years according to the World Bank, just one of many recent alarming reports on the world’s fresh water supply.
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A
are suffering
B
have been suffered
C
will suffer
D
were suffered