David didn’t give up ______ he had failed in the experiment four times.
#57729
A
if
B
while
C
though
D
since
推荐题目
If I ______ five minutes, I will get everything ready.
#57664
A
will give
B
be given
C
am given
D
was given
Mary sings English songs well and ______.
#55513
A
Jane does too
B
either does Joes
C
so Janes does
D
so does Jane
