— No one can answer the question _______ we can complete the task in time, do you know? — Yes, and this is because we don’t know the way _______ the scientist used last time．
#69635
A
whether; which
B
if; which
C
whether; in which
D
if; in which
推荐题目
I have a lot of homework to do today, _________ I cannot go swimming with you.
#41201
A
because
B
so
C
then
D
But
Much disappointed as he is _______ in the job interview, he still keeps his confidence.
#67795
A
failed
B
to have failed
C
having failed
D
Failing
you may have, you should gather your courage to face the challenge.
#68062
A
However a serious problem
B
What a serious problem
C
However serious a problem
D
What serious a problem
The teacher speaks very loudly all the students can hear her.
#41410
A
so that
B
because
C
since
D
when