When and why he came here 作為一個整體,
謂語動詞用單數(shù)形式..
句意:他何時和為何來這的原因還未知.!'
選AAAAAAAA.
when and why he came here _____ yet.
when and why he came here _____ yet.
A.is not known
B.are not known
C.has not known
A.is not known
B.are not known
C.has not known
英語人氣：981 ℃時間：2019-12-24 12:22:24
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