单项选择题
The teacher doesn't allow his students（） on the exam.
A．cheated B．cheating C．cheat D．to cheat
单项选择题 （）wecansucceedornotdependsonhowwellwecooperate.
单项选择题 Janehadn'tbeentoLondonbefore（）hadherhusband.
单项选择题 NosoonerhadhearrivedinRome（）heheardofthegoodnews.
