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
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Only after spending several nights working on the math problem to wonder whether the problem was wrongly set.
#83176
A
had he begun
B
he began
C
did he begin
D
began he
The more careful you are while writing a composition，________.
#81893
A
you make the fewer mistakes
B
the few mistakes would you make
C
the fewer mistakes you will make
D
fewer mistakes will be made
So suddenly ________that the animals in the zoo looked very frightened during the total solar eclipse (日全食)．
#81424
A
did the sky turn dark
B
the sky did turn dark
C
turned the sky dark
D
was the sky turned dark
—— My mother does a lot of housework before going to work,but she has never been late. —— ＿＿＿＿＿.
#83912
A
So does my mother
B
Neither does my mother
C
Nor has my mother
D
So it is with my mother
______________ about wild plants that they decided to make a trip to Madagascar for further research.
#81874
A
So curious the couple were
B
So curious were the couple
C
How curious the couple were
D
The couple were such curious