The drinking water has become contaminated with leaD.

The drinking water has become contaminated with leaD.A.polluted B.treated C.test

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The patient received the first self-contained heart_________

The patient received the first self-contained heart__________.A.could not afford

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回答(12)题

回答(12)题A.your B.our C.His D.their

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回答(8)题

回答(8)题A.correct B.proper C.right D.suitable

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回答(59)题

回答(59)题A.Yet B.Unless C.Although D.Once

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