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【参考答案】

∧ defined→ be
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单项选择题
A．It increases the cost of car production.B．Carmakers are not sure if it is useful.C．The research on it is still being carried out.D．People still have their doubts.
A．It increases the cost of car production.
B．Carmakers are not sure if it is useful.
C．The research on it is still being carried out.
D．People still have their doubts.
填空题
involve→involves
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