单项选择题

While visiting France, we decided to do some shopping. Not far from the hotel was a store with all kinds of clothing hanging up, and a notice offering 50 percent reduction (减少).
When we entered the shop, a woman asked if she could help us but we would like to look around on our own. She looked at us rather strangely.
Not finding anything suitable, we thanked the woman and left. Suddenly my husband started to laugh and pointed to a small sign in English. It said: "DRY-CLEANING SHOP".

The man laughed suddenly when().

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