单项选择题

All of the tourists would have enjoyed themselves more if there ______ offers for free insurance policies.

A．were
B．have been
C．had been
D．should be
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Children tend to rely on ______ school friends to keep in touch with schoolwork.
A．concern
B．concerning
C．concerned
D．to concern
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He ______ the bully in the chest, sending him knocking against the wall.
A．punched
B．slapped
C．tapped
D．stroke
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