1编号：4162题型：单选题测试正确率：59.66%
—Were you at school when he came to see you? —Yes, I ______ a math class.
2编号：4157题型：单选题测试正确率：56.82%
When I came back yesterday evening, my brother ______ his homework.
3编号：4153题型：单选题测试正确率：59.66%
I met a good friend of mine while I______ on the street.
4编号：4146题型：单选题测试正确率：64.77%
—I called you at 4:00 yesterday afternoon, but no one answered. —Sorry, I ______ with my friends at that time.
5编号：3353题型：单选题测试正确率：87.37%
—I called you at half past nine this morning, but there was no answer. —Oh, sorry, I______ with my cousin in the supermarket.
6编号：3259题型：单选题测试正确率：73.18%
It ______hard when I left my house.
7编号：3071题型：单选题测试正确率：70.92%
The boy ______ English on the radio when I ______ his door.
8编号：3070题型：单选题测试正确率：60.93%
He ______ his leg when he ______ in a football match.
9编号：3042题型：单选题测试正确率：71.59%
This time yesterday Jack ______ his bike. He ______ TV.
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