单项选择题

______ no friction, an automobile could not move.

A. Was there
B. Were there
C. There was
D. If there was
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单项选择题
For a child ______ to give up his less mature idea for a more sophisticated one, it requires that the child psychologically ready for the new idea.
A. is
B. be
C. were
D. would be
单项选择题
If only my sister ______ here with us.
A. be
B. were
C. is
D. has been
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