It was not until the teacher had explained it three times _______ how to work out the problem.
#92129
A
did he understand
B
had he understood
C
that he understood
D
that he didn’t understood
推荐题目
_____ is no doubt ______ you have to remain seated and fasten your seatbelt before the plane lands.
#91896
A
There; whether
B
It; that
C
There; that
D
It; whether
It was not until the beginning of the twentieth century________to explore space.
#93086
A
did man begin
B
when man began
C
that man began
D
then man began
——The Thirteen Women in Nanjing directed by Zhang Yimou is said to be well worth seeing.——You must be kidding! It’s one_____in at least a year.
#93278
A
Completed
B
completing
C
to be completed
D
having been completed
It is the third time so far that such a festival ________in my hometown.
#92063
A
has held
B
has been held
C
will be held
D
had been held