Not until he left his home _____ to know how important the family was for him. 
#80776
A
did he begin
B
had he begun
C
that he began
D
he had begun
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Generally speaking_______acording to theinstructions,the drug has no side effect.
#79957
A
when taking
B
when taken
C
when to take
D
when to be taken
Only the factory ____ yesterday ____  this kind of machines.
#83079
A
did we visit; does it produce
B
did we visit; produces
C
we visited; produces
D
we visited; does it produce
Only after the woman had her own child ________ how difficult it was to be a mother.
#80818
A
she realized
B
had she realized
C
she had realized
D
did she realize