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
When I talked with my grandma on the phone, she sounded weak, but by the time we ____ up, he voice had been full of life．
#104124
A
were hanging
B
had hung
C
hung
D
would hang
Land animals are believed ______ from sea animals.
#103259
A
to have developed
B
to have been developed
C
having developed
D
having been developed
Would you please _________ my good wishes to your parents?
#100737
A
convey
B
tell
C
explain
D
translate
This is the first time we _______ a film in the cinema together as a family.
#101676
A
see
B
had seen
C
saw
D
have seen