单项选择题
It must have rained last night, ______ the ground is we...
单项选择题It must have rained last night, ______ the ground is wet. ( )
--I can't see the blackboard very well.--Perhaps you ne...
单项选择题--I can't see the blackboard very well.--Perhaps you need ______. ( )
I have never ______ such a man. ( )A.he...
单项选择题I have never ______ such a man. ( )