In Hong Kong, doctors reported that, for unclear reasons, 12 recovered $ARS patients had（）weeks after they had been discharged-spurring fears that people might be infectious even after they'd left isolation.

He drove fast and arrived an hour（）schedule. A．in advan...

单项选择题He drove fast and arrived an hour（）schedule.

The janitor's long service with the company was（）a pres...

单项选择题The janitor's long service with the company was（）a present.

The trouble is that not many students really know how t...

单项选择题The trouble is that not many students really know how to make use of their time to its best（）