I was about to give up my effort to solve a problem __________ a good idea struck me.
#30835
A
when
B
while
C
until
D
before
推荐题目
Tom has two cousins, and ______ are engineers.
#31634
A
both of whom
B
both of them
C
none of them
D
either of them
______ is often the case is that Tom doesn’t study hard and fails in passing an exam.
#31422
A
That
B
What
C
It
D
As
—How long have you been working as an assistant here?—__________I finished middle school.
#31802
A
Ever since
B
Before
C
After
D
When
I should convey my appreciation to my high school teachers, without ____ help I wouldn’t achieve such a big success.
#33344
A
whom
B
them
C
which
D
whose