单项选择题

Remember to ask for a ______ of quality for these goods; otherwise they will not offer any maintenance.

A．certificate
B．receipt
C．warranty
D．mark
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单项选择题
Soon after the drug ______ effect, the patient became quieter.
A．brought
B．made
C．took
D．released
单项选择题
Mr. Brown made up his mind that ______ could he betray his wife.
A．at no circumstances
B．in no circumstances
C．at no circumstance
D．in no circumstance
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