题目内容

Many small businesses _____ due to the financial crisis.
A: fell
B: dropped
C: collapsed
D: slipped

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负责产品退货率的部门是客服部门。()

Please remind me _____ the director at 10.
A: to seeing
B: seeing
C: to see
D: by seeing

He seemed _______ the secret.
A: know
B: to know
C: knowing
D: known

It is unlikely ____ the world energy will last forever.
A: that
B: which
C: because
D: for

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