一道英语语法题!I have been working for three hours when I suddenly
一道英语语法题!
I have been working for three hours when I suddenly became sick.
为什么不能是 I have worked for three hours when I suddenly became sick.
I had been working for three hours when I suddenly became sick.
为什么不能是 I have worked for three hours when I suddenly became sick.
I have been working for three hours when I suddenly became sick.
为什么不能是 I have worked for three hours when I suddenly became sick.
I had been working for three hours when I suddenly became sick.
为什么不能是 I have worked for three hours when I suddenly became sick.
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1年前6个回答
你能帮帮他们吗