单项选择题

We were ______ for an hour in the traffic and so we arrived late.

A．kept off
B．held up
C．put back
D．broken down
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单项选择题
Every month, Mrs. Smith ______ all her bills before she pays them.
A．adds into
B．adds to
C．adds up to
D．adds up
单项选择题
He can't run a hundred yards, ______ a mile.
A．less than
B．still less
C．no less
D．less even
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