题目
A.Had… would have happened
B.Were … would have happened
C.Were … would happen
D.Should … would have happened
第3题
A.竹纤维、PLA纤维、壳聚糖纤维
B.壳聚糖纤维、竹纤维、PLA纤维
C.壳聚糖纤维、PLA纤维、竹纤维
D.竹纤维、壳聚糖纤维、PLA纤维
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