______ he is very busy, Li Ming always helps others.
#56088
A
Although
B
If
C
Unless
D
Since
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Mr. Brown is 70 this year. Although he is very old, ____ he works very hard.
#58159
A
and
B
but
C
so
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This question is very difficult __________ I ask my brother for help.
#55591
A
but
B
or
C
because
D
so