问题

I rang you at about ten, but there was no reply.— Oh, that was probably ____ I was seeing the doctor

A:when
B:why
C:what
D:that

正确答案是：

同类题型

On no account to the teacher

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The U.S. President Barack Obama arrived in China’s economic center Shanghai on Sunday nightof November 15th 2009, ______a state visit to China.[ ]