I don't know _____ tomorrow．Can you tell me?

　　A．when we started　　 B．when did we start

　　C．when we will start D．when will we start

I don’t know _____ tomorrow. Can you tell me?

A. when we started       B. when did we start

C. when we will start     D. when will we start

完形填空。

　　Mr. Clark worked in an office. He had a lot of work to do every day. But later he began to 　1　 things and this made his work very 　2　. One day Mr. Clark said to himself, “I 　3　 go to see Dr. Martin.”

　　He waited at least two hours in the doctor's waiting-room 　4　 there were 　5　 people who also wanted to see the doctor. 　6　 the nurse said to him,“You can come in and see Dr. Martin now.”

　　“What can I do for you?” asked Dr. Martin.

　　“Oh, doctor,” said Mr. Clark. “There is something wrong with my 　7　. I can't remember 　8　. I have no way to keep things in mind for 　9　 than half a minute. And it's making my work very difficult. What can I do? Can you help me?”

　　“When did it start, Mr. Clark?” The doctor asked.

　　“When did 　10　 start?” Mr. Clark asked.

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