Only when they were put in prison and lost freedom(自由) _________ its importance.
#81127
A
they realized
B
did they realize
C
realized they
D
had they realized
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Not until then _____ their marriage was breaking up because they had little in common.
#83081
A
did I realize
B
I realized
C
had I realize
D
has I realized
________ that Marie was able to set up new branches elsewhere.
#80109
A
So successful her business was
B
So successful was her business
C
So her business was successful
D
So was her successful business
Never before ___________in greater need of technical experts than it is today.
#84456
A
has Shenyang been
B
Shenyang has been
C
was Shenyang
D
Shenyang was
Not until we have had a chance to discuss it thoroughly ________ perfectly.
#79660
A
the problem has been settled
B
has the problem been settled
C
will the problem be settled
D
the problem was settled
The research is so designed that once _____ nothing can be done to change it.
#84615
A
begins
B
having begun
C
beginning
D
begun