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【单选题】
John and I ________ friends for eight years. We first got to know each other at a Christmas party. But we ________ each other a couple of times before that.A.
had been; have seen
B.
have been; have seen
C.
have been; had seen
D.
had been; had seen
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【简答题】An acid reacts with a base to produce a salt and water. Hydrogen from the acid combines with ( ) from the base to form water molecules.
【简答题】An acid reacts with a base to produce a ( ) and water. Hydrogen from the acid combines with hydroxide from the base to form water molecules.
【单选题】-I don't feel like going out. Why don't we stay at home and watch TV? - _________ You promised to take me out for a ride. [ ]
A.
Really?
B.
Not at all.
C.
Come on !
D.
No matter.
【单选题】—I don't feel like going out. Why don't we watch TV at home? — ______ You promised to take me out for dinner.
A.
Come on!
B.
Really?
C.
Not at all.
D.
Why not?
【单选题】下列因素中，不会引起甲状腺大部切除术后呼吸困难和窒息的是
A.
手术创伤的应激诱发危象
B.
切口内出血压迫气管
C.
气管软化塌陷
D.
喉头水肿
E.
喉返神经损伤两侧声带麻痹
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