单项选择题 In Hong Kong, doctors reported that, for unclear reasons, 12 recovered SARS patients had （） weeks after they had been discharged -- spurring fears that people might be infectious even after they’d left isolation.

单项选择题 （）, I picked up the phone and rang my sister in AustraliA．

单项选择题 The manager of the company firmly believed that one of the important （） sources of new customers was the children’s market.