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
He________go to bed_______he finished his homework.
#56992
A
doesn’t; until
B
doesn’t; and
C
didn’t; until
D
didn’t; for
---Did you also walk to Zhenguo Temple, Gaoyou from Yangzhou ?---Yes, it was a great trip ______ we didn’t enjoy it ______ the beginning because it rained .
#57911
A
and; in
B
or; at
C
so; at
D
but; at
— They speak perfect English. How long have they learnt it?— ______ they were seven years old.
#56728
A
Since
B
When
C
After
D
Until