________, it began to rain unexpectedly.
#68281
A
While cleaning the machine
B
To clean the machine
C
He was cleaning the machine
D
While he was cleaning the machine
推荐题目
．What I like about Harvard is there’s the old classical look—there are parks and traditional buildings.
#69148
A
why
B
where
C
that
D
how
You’d better choose someone you think kind and friendly to help you.
#68647
A
whom; to be
B
who; is
C
that; is
D
which; to be
．____ tomorrow, I will pay a visit to my grandparents．
#69066
A
However the weather is like
B
However is the weather like
C
Whatever the weather is like
D
Whatever is the weather like
___is certain is ___prevention is more important than treatment .
#73499
A
It;that
B
What;that
C
As;what
D
What;what
______ advice I give him , he just does not listen.
#68212
A
However
B
No matter how
C
No matter
D
Whatever