单项选择题

When climbing the hill, John was knocked unconscious by an______rolling stone.

A．untouched
B．unfamiliar
C．unexpected
D．unbelievable
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单项选择题
John likes Chinese food, but be______eating with chopsticks.
A．doesn't used to
B．doesn't use to
C．isn't used to
D．used not to
单项选择题
______you don't know the rule won't be a sufficient excuse for your failure.
A．It is
B．That
C．Because
D．What
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