David doesn’t give up _______ he has failed in the experiment four times.
#57463
A
if
B
while
C
though
D
since
推荐题目
Tom was walking along the riverside when he heard someone calling him from behind. He turned around_______ found nothing.
#56161
A
but
B
and
C
so
D
or
—_________ is your sister? — The girl on the right wearing blue jeans.
#55822
A
Where
B
Whose
C
What
D
Which
The story was written in______ easy English_____ even the seven-year-old child could understand it.
#56560
A
very, that
B
so, that
C
too, to
D
such, that