Ⅱ. 单项选择
21. Our homework is quite different from _______ before.
A. that it was B. what it was C. which it was D. when it was
22. A computer can only do _______ you have instructed it to do .
A. how B. after C. what D. when
23. It was because of bad weather_______the football match had to be put off.
A. so B. so that C. why D. that
21. Our homework is quite different from _______ before.
A. that it was B. what it was C. which it was D. when it was
22. A computer can only do _______ you have instructed it to do .
A. how B. after C. what D. when
23. It was because of bad weather_______the football match had to be put off.
A. so B. so that C. why D. that

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