{01}When plastics are burned, a very poisonous gas will ______. A.be given out B.be given off C.be given in D.be given away 解析: 本题选B。 {02}The door remains ________. A.locking B.locked C.closing D.to lock 解析:remain是连系动词,后面接形容词作表语,因而答案D不对;又因为door与lock之间是被动关系,所以正确答案为B。 本题选B。
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