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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______he is a hard-working person, he has not been successful in business.
A. Since
B. Although
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单项选择题
I have bought a story book ______there are many pictures.
A. in which

B. with which
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