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
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____, the airport is closed at the moment.
#92915
A
Because of the weather is bad
B
Due to the bad weather
C
Because the weather bad
D
As the bad weather
Rather than________on a crowded bus, he always prefers___________a bicycle.
#94665
A
ride, ride
B
riding, to ride 
C
ride, to ride
D
to ride, riding
 With the help of the high technology, this year the factory has produced ________ it did last year.
#91907
A
twice as many as
B
twice as many cars as
C
twice as many as cars
D
twice cars as many as
 _______he was laid off last year ______ how serious the economic crisis was.
#93917
A
Not until…he realized
B
It was not until… when he realized
C
It is not until…that did he realize
D
It was not until …that he realized
      but he still can not understand it.
#92866
A
Told many times
B
Having been told many times
C
He has been told many times
D
Though he has been told many times