The special medicine for the disease was difficult to find though ________ everywhere.
#79519
A
sought
B
having sought
C
being sought
D
having been sought
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Not until____ did Humphrey begin working. 
#80292
A
did it stop raining
B
had it stopped raining
C
it stopped raining
D
it stops raining
He said that not until the heavy snow blocked the express _________ how serious the weather was.
#81796
A
did the tourists realize
B
the tourists realized
C
the tourists did realize
D
didn’t the tourists realize