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【单选题】
在几种塑料材料中,( )是当前工业产量最大的塑料品种。A.
聚乙烯
B.
聚丙烯
C.
聚苯乙烯
D.
聚氯乙烯
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皮皮学刷刷变学霸
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【单选题】I______to Beijing. I______ there last year. [ ]
A.
have just gone; went
B.
have just been; went
C.
have just gone; have gone
D.
have just been; have been
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