单项选择题
A.working for
B.working on
C.taking on
D.taking for
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单项选择题
A.rockB.earthquakeC.faultD.crust
A.rock
B.earthquake
C.fault
D.crust
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单项选择题
A.deadB.deadlyC.fatalD.mortal
A.dead
B.deadly
C.fatal
D.mortal
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