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Itiseasytothinkthatawitnesswhosawacrimewillbeabletogivealltheanswers.A,tobecommittedB,commitC,committingD,beingcommitted为什么选D

题目详情
It is easy to think that a witness who saw a crime will be able to give all the answers.
A,to be committed B,commit C,committing D,being committed 为什么选D
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答案和解析
这是非谓语动词,修饰的是crime,看时态,应该是正在发生才能被目击者看到,所以ing.再看语态,因为是被做,所以用ed,综合选D