单项选择题

A．There is nothing that worries him.
B．He didn’t do any studying.
C．He studied very hard.
D．He was bored.
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单项选择题
A．The giant bird cage.B．The tiger house.C．The monkey and ape habitat.D．The tropical rainforest exhibit.
A．The giant bird cage.
B．The tiger house.
C．The monkey and ape habitat.
D．The tropical rainforest exhibit.
单项选择题
A．thenB．thereforeC．isD．however
A．then
B．therefore
C．is
D．however
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