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题:I ( )go to bed when the doorbell的答案 A.was going to B.was to C.was about to D.would

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题:I ( )go to bed when the doorbell的答案 A.was going to B.was to C.was about to D.would
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答案和解析
c
这种句式只能用三种表达方式
be about to do
be doing
had just done