单项选择题

I don't swim now, but I ______ when I was a child.

A. used to do
B. used to doing

C. was used to doing
D. was used to do
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单项选择题
The little boy had no choice but to look on ______ as his, mother was seriously injured in the traffic accident.
A. help
B. helpless
C. helpness

D. helplessly
单项选择题
______he is a hard-working person, he has not been successful in business.
A. Since
B. Although
C. Unless
D. However
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