——Did you know any Chinese before you arrived in Beijing?——Never ________it, actually.
#80572
A
had I learned
B
have I learned
C
I have learned
D
I had learned
推荐题目
 _______ about wild plants that they decided to make a trip to Madagascar for further research. 
#81269
A
So curious the couple was
B
So curious were the couple
C
How curious the couple were
D
The couple was such curious
Only after a baby seal is pushed into the sea by its mother _____ to swim. 
#82603
A
how will it learn
B
will it learn how
C
it will learn how
D
and it learns how
It was only when I read this story for a second time________to appreciate its beauty.
#83350
A
did I begin
B
that I began
C
then I began
D
had I begun