the whole process for the studies of cancer took more than a year, the technology is moving so fast that it will soon take just weeks．
#31066
A
How
B
Because
C
If
D
While
推荐题目
Criticism is highly necessary ____it helps to monitor the progress of our work．
#34176
A
in which
B
for which
C
so that
D
in that
________I was in trouble, he would come to help me out.
#31120
A
Every time
B
The first time
C
for the first time
D
Next time
—Do you know about the accident which happened in the center of the city? —Yes. But it was some time we realized the truth.
#30209
A
before
B
when
C
since
D
until
—I rang you at about nine，but there was no reply．—Oh，that was probably I was seeing the doctor．
#30192
A
why
B
when
C
what
D
that