单项选择题

A．advantages
B．consequences
C．problems
D．potentials
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单项选择题
A．stepped inB．settled downC．leaned overD．mined out
A．stepped in
B．settled down
C．leaned over
D．mined out
单项选择题
______ that the earth was flat
A．Used it to be thought
B．Did it used to be thought
C．Was it used to being thought
D．Does it used to be thought
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