Only after he had spent several nights working on the math problem _______ to wonder whether the problem was wrongly set.
#83053
A
that he began
B
did he begin
C
then he began
D
so that he began
推荐题目
On the small island，which is at the entrance to New York Harbor, ．
#79615
A
the Statue of Liberty stands
B
stands the Statlle of Liberty
C
does the Statue of Liberty stand
D
does stand the Statue of Liberty
Generally speaking, if ______ strictly following the instructions, the electric bike is not as dangerous as reported.
#79976
A
riding
B
being ridden
C
to be ridden
D
ridden
_________ for the free tickets, I would not have gone to the films so often.
#84191
A
If it is not
B
Were it not
C
Had it not been
D
If they were not
There are some health problems that, when ______ in time, can become bigger ones later on.
#79547
A
not treated
B
not being treated
C
not to be treated
D
not have been treated
It is rather difficult to make friends with her, but her friendship, _______, is truer than any other’s.
#84387
A
while gaining
B
after gaining
C
when to gain
D
once gained