题目
In recent years different ways ________ to recycle the plastic wastes.
A.
tried
B.
were tried
C.
have tried
D.
have been tried
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In recent years different ways ________ to recycle the plastic wastes.
tried
were tried
have tried
have been tried
答案与解析
自由组卷
围绕这道题再组一份练习 →
完整试卷
浏览同年级试卷结构 →