My parents were quarrelling about me ____ I could not quite tell why．
#79999
A
since
B
though
C
if
D
until
推荐题目
Some of the people often ask the same question the air has been polluted.
#30604
A
whether
B
if
C
that
D
where
______ I went to Mount Hua, I was deeply impressed with its beautiful scenery.
#30935
A
For the first time
B
The first time
C
At first
D
It was the first time
Although he had only entered the contest for fun, _________ he won first prize.
#79835
A
but
B
and
C
even
D
不 填