两道类似单选的疑惑
1,
---Alice,whydidn’tyoucomehereyesterday?
---I____,butmysonsuddenlyfellillandIhadtotakehimtothehospital.
A.hadB.didC.wasgoingtoD.didn’t
第题选B
2,
Alicewhydidn’tyoucomeyesterday?”
“I_______,butUhadanunexpectedvisitor.”
A.hadB.wouldC.wasgoingtoD.did
这题选C
这两题异曲工但为什么答案不一样