单项选择题

Successive committees have ______ over this problem without finding a solution.

A．reckon
B．ponder
C．speculate
D．presume
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单项选择题
In China, all the students between the ages of 7 and 16 or so must receive nine-year ______ education.
A．constrained
B．compulsory
C．cardinal
D．conventional
单项选择题
Ms. Green has been living in town for only one year, yet she seems to be ______ with everyone who comes to the store.
A．acquainted
B．informed
C．accustomed
D．accepted
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