Scientists study ___________ human brains work to make computer.
#31794
A
when
B
how
C
that
D
whether
推荐题目
－Sir，may I borrow some new books?－Sorry，you can't________you haven't turn back those you borrowed one month ago.
#30673
A
unless
B
before
C
because
D
until
I recorded the professor’s speech on my cellphone _____ I could listen to it several times later.
#33276
A
in case
B
now that
C
even though
D
so that
Some people get in touch with each other by mobile phones__________ others keep contact with each other by e-mail.
#31283
A
when
B
before
C
while
D
since
—How long have you been working as an assistant here?—__________I finished middle school.
#31802
A
Ever since
B
Before
C
After
D
When
My parents live in a small village. They always keep candles in the house ___ there is a power cut.
#79986
A
if
B
unless
C
in case
D
so that