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1.( ).---We haven’t heard from Susan a long time .

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1.( ).---We haven’t heard from Susan a long time .
---What do you suppose _____ to her?
A.was happening B.has happened
C.to happen D.having happening
2.( ).They built a wall to avoid soil ____
A.to wash away B.washing away
C.to be washed away D.being washed away
3.( ).---I hear that you and Francis will spend your vacation in Nepal next spring.
---Yes,we are planning ___
A.to B.to be C.it D.to do it
1.( ).---We haven’t heard from Susan a long time .
BDA
1.do you suppose 是插入语,可以去掉,就B
2.avoid doing sth.,因为土壤是被冲走,就用被动语态
3.是省略的内容,同样的有I think so . I'd like to.