When and where he came here _______ yet.A．isn’t knownB．aren’t knownC．has not kno

题型：不详难度：来源：

When and where he came here _______ yet.

A．isn’t known

B．aren’t known

C．has not known

D．have not been known

答案

解析

略

举一反三

We hope that you can buy this material because it_____ well.

A．is washed

B．is washing

C．will be washed

D．washes

题型：不详难度：| 查看答案

Jack_____his leg. Otherwise, he would have won the race.

A．had broken

B．broke

C．has broken

D．would break

题型：不详难度：| 查看答案

The teacher reported to the headmaster how the class meeting ________ the day before.

A．had been organized

B．was being organizing

C．has been organized

D．was organized

题型：不详难度：| 查看答案

He told us he _____ a concert _____ .

A．had attended ... three days before	B．attended ... three days ago
C．would attend ... since three days	D．was attending ... for three days

题型：不详难度：| 查看答案

The new Hukou(户口) policy, according to some experts, ______ to attract more high-end talents to contribute to Shanghai’s development.

A．serves

B．serving

C．to serve

D．is served

题型：不详难度：| 查看答案