________, 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
The growing speed of a plant is influenced by a number of factors，________ are beyond our control.
#66759
A
most of them
B
most of which
C
most of what
D
most of that
One generation plants the trees under shade another generation rests.
#68643
A
which
B
where
C
whose
D
what
"Who Moved My Cheese?", ____________ is a best-selling book, is written by Spencer Johnson.
#72099
A
which
B
that
C
it
D
what
The river______ are covered with trees is polluted.
#74034
A
of which the banks
B
whose banks
C
the banks of which
D
A,B,C are right