单项选择题

He expressed doubt（）Americans were willing to give up moving from place to place to seek better opportunities.

A．whether
B．that
C．how
D．which

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单项选择题
On his visit to the school years later, Peter was astonished to find himself（）at once.

A．remembering
B．remembered
C．being remembered
D．having remembered
单项选择题
The teacher told the children there（）four seasons in a year: spring, summer, autumn and winter.

A．is
B．was
C．are
D．were
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