Bob is young, _______ he knows a lot. 
#58536
A
because
B
so
C
but
D
unless
推荐题目
---_______does your mother watch the Talk show? ---Once a week.
#56342
A
How long
B
How often
C
How soon
D
How many
 --_______ will the meeting last? --_______ they reach an agreement.
#55956
A
How long; Not until
B
When; Not until
C
How long; Until
D
When; Until