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
Paul had to write a history paper, _____ he couldn’t find time to do it.
#33195
A
but
B
so
C
because
D
if
—I’m going to the post office.— you’re there, can you buy me some stamps?
#31507
A
Because
B
While
C
As
D
If
---Mum, can I go out to play football with Alice? ---No, you can’t your homework is done.
#33770
A
while
B
after
C
until
D
as
________ you are responsible for the information, you must be very careful.
#31810
A
Unless
B
While
C
Since
D
Though