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【单选题】
弹子油杯润滑( )至少加油一次。 答案A.
每周
B.
每班次
C.
每天
D.
每月
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C.
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A.
tells us that dating is a nice experience
B.
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is to celebrate
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is celebrated
D.
has been celebrated
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A.
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which
C.
what
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A.
their family members
B.
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