When he knocked at the door, my mother was busy ____ supper.
#94849
A
preparing for
B
in preparing
C
to prepare for
D
to prepare
推荐题目
I was really too busy with my homework and I couldn't help ____________ housework.
#94991
A
doing
B
do
C
did
D
done
How long do you think it will be _______ scientists succeed in providing a cure for cancer?
#92242
A
when
B
after
C
since
D
before
As a young man, there was __________ time __________ I hated to go to school .
#92765
A
a; that
B
a; when
C
the; that
D
the; when
Finding her car stolen, _____.
#93600
A
a policeman was asked to help
B
the area was searched thoroughly
C
it was looked for everywhere
D
Mrs. Green reported it to the police