单项选择题
A.invention
B.creation
C.atomic bomb
D.electricity
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单项选择题
A.byB.beforeC.afterD.since
A.by
B.before
C.after
D.since
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单项选择题
A.passingB.passedC.has passedD.had passed
A.passing
B.passed
C.has passed
D.had passed
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