When l workde along the street,I was surprised to find that many people were wearingmasks over their mouths for fear that________(他们可能会感染）H1N1(contract）
问题描述：
When l workde along the street,I was surprised to find that many people were wearing
masks over their mouths for fear that________(他们可能会感染）H1N1(contract）
答