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she's upstairs ___ letter

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she's upstairs ___ letter
A write B is writing C write D writing
2.seeing is _____.
believing
3.what have we said ___her so unhappy?
she's upstairs ___ letter
1.upstairs是状语,你可以看成She's writing letter upstairs
2.百闻不如一见
3.这里的have是助动词,相当于do,就前半句形式上已经是个完全的句子,后面不能再出现东西原型,所以用不定时代替,表结果.
如果你选的是make,那应该是what we have said makes her so uphappy.这时就不是问句了