单项选择题

Mr. Green（）his breakfast when an old lady came to the door.

A. just had
B. have just had
C. just have had
D. had just had

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单项选择题
We were so busy that we had to（）going on holiday for a month.

A. put away
B. put down
C. put off
D. put out
单项选择题
The sun heats the earth,（）is very important to the living things.

A. which
B. that
C. as
D. what
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