单项选择题

To drive a car safely, it is ______ good brakes.

A．essential with
B．essential having
C．essential to have
D．essential have
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单项选择题
When traveling, it is possible that you may be advised to take the travelers' checks, which provide a secure ______ to carrying your money in cash.
A．selection
B．preference
C．alternative
D．substitute
单项选择题
Because of the bad food he had eaten, his stomach began to ______.
A．pain
B．be hurt
C．ache
D．harm
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