单项选择题

A.in
B.on
C.by
D.with
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单项选择题
A.working forB.working onC.taking onD.taking for
A.working for
B.working on
C.taking on
D.taking for
单项选择题
A.rockB.earthquakeC.faultD.crust
A.rock
B.earthquake
C.fault
D.crust
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