David didn’t give up ______ he had failed in the experiment four times.
#58224
A
if
B
while
C
though
D
since
推荐题目
—_______ is the meeting room, Mrs. Smith? —It’s about 20 meters long and 10 meters wide.
#55484
A
How big
B
How far
C
How tall
D
How long
I’ll buy ______ this dress ______ that one. They are too large for me.
#55334
A
either, or
B
not only, but also
C
neither, nor
D
both, and
--Hurry up! The bus is coming.--Wait a minute. Don’t cross the street the traffic lights are green.
#56768
A
until
B
after
C
while
D
since