单项选择题

The building of the new road has been________ by bad weather.

A．held off
B．held down
C．held in
D．held up
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单项选择题
The sellers signed the________ promising to ship the goods before the end of July.
A．contact
B．treaty
C．agreement
D．contract
单项选择题
If children have flu-like symptoms, their parents________.
A．are advised not to give them aspirin
B．should watch out for signs of Reye syndrome
C．are encouraged to take them to hospital for vaccination
D．should prevent them from mixing with people running a fever
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