Although he is very old, _________ he works very hard.
#56101
A
and
B
but
C
/
D
so
推荐题目
Tom can play the guitar, ______ he can’t play it ______. 
#55551
A
or, good
B
and, well,
C
but, good
D
but, well
Don’t get off the bus ________it has stopped.
#55561
A
until
B
if
C
because
D
though
   _______   I  know,  he  is  kind.
#55806
A
As soon as
B
As long as
C
As far as
D
As well as