场景(六) 2008年2月某手表厂为纪念建厂30周年，特制纪念手表1000只，每只售价1万元，2008年2月18日的广告上宣称：纪念表镶有进口天然钻石。张某于2008年3月10日购得一只此表。2008年3月20日，张某将所购的表送权威部门鉴定后证实，该表进口天然钻石实际为人造钻石，每粒价格为100元，手表成本约500元。
根据场景(六)，回答下列问题：
如为可撤销合同，张某应在( )前行使撤销权。
A．2009年2月18日
B．2009年3月10日
C．2009年3月20日
D．2009年3月31日
参考答案：C
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| Anna lived on the side of a valley. One summer, there was a very big 1 , and a lot of houses down below Anna's were washed away. Anna's house was 2 enough to escape the flood, so when the water had 3 and the other houses were standing there 4 no roof and no walls and all covered with mud(泥), her house was just all right. Her house was quite small, her husband was dead, and she had four children, 5 Anna took in one of the families that had lost 6 in the flood and she 7 her home with them until it was 8 for them to rebuild their house. Anna's friends were 9 when they saw Anna do this. They could not understand why Anna wanted to give 10 so much more work and trouble when she already had quite a few children to 11 . "Well," Anna 12 her friends, "at the end of the First World War, a woman in the town where I then lived found herself very 13 , because her husband had been killed in the 14 and she had a lot of children, 15 I have now. The day before Christmas, this woman said to her children, 'We won't be able to have much for 16 this year, so I'm going to make only one present to all of us. Now I'll go and get it.' She came back with a 17 who was even poorer than they, and who had no parents. 'Here's our 18 ,' she said to her children. The children were 19 and happy to get such a present. They 20 the little girl, and she grew up as their sister. Such was that Christmas present." | ||||
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