单项选择题

Remember to ask for a______ of quality for the consumer goods; otherwise they will not of- fer any maintenance.

A．certificate
B．mark
C．warranty
D．receipt
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单项选择题
In the face of the evidence, the criminal had to______ his guilt to the court.
A．admit
B．acknowledge
C．accept
D．confess
单项选择题
The building of the new subway lines in the city has been ______due to lack of enough in- vestment.
A．held up
B．held on
C．held out
D．held back
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