单项选择题

She told her little brother ______ her hand tightly while they were crossing the busy street.

A．hold on to
B．holding on to
C．held on to
D．to hold on to
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单项选择题
If I didn't ______ them ______ I should probably forget all about them.
A．wrote; down
B．write; down
C．write; for
D．written; about
单项选择题
It is stated in the passage that those responsible for giving a product customer- appeal are ______.
A．customers
B．designers
C．advertisers
D．manufacturers
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