e-commerce worries some merchants, it contributes to the development of delivery industries.
#30582
A
When
B
Unless
C
While
D
Until
推荐题目
Livemocha.com is a free site ______visitors can not just learn various languages but also chat online.
#30884
A
where
B
which
C
that
D
what
No one knows exactly ______ this important discovery was made.
#33284
A
that
B
that how
C
what
D
when
．Every time Ashtita tries to break a record, he reaches a point ______ he feels he cannot physically do any more．
#33715
A
where
B
that
C
when
D
which
Don’t stand by when you come across________ have difficulty in supporting their family because of serious illness.
#30364
A
Who
B
Whoever
C
Whichever
D
Whomever
The house, ______walls are red, is where my grandfather used to live ten years ago.
#31106
A
which
B
of which
C
whose
D
that