单项选择题

______the population is too large, the government has to take measures to control the birth rate.

A. Although
B. Since
C. If
D. Until
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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
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
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