this is the machine ()we have had so much trouble这里面应该填什么?

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thisisthemachine()wehavehadsomuchtrouble这里面应该填什么?thisisthemachine()wehavehadsomuchtrouble这里面应该填什么?th

this is the machine ()we have had so much trouble这里面应该填什么?
this is the machine ()we have had so much trouble
这里面应该填什么?

this is the machine ()we have had so much trouble这里面应该填什么?
with which
后面是定语从句,所以用关系代词which
have trouble with sth 对.有困难
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