His failure in the exam suggested that he __________ the teacher’s instructions.

题型：不详难度：来源：

A．can’t have followed	B．needn’t have followed
C．mustn’t have followed	D．shouldn’t have followed

答案

解析

can用于否定句和疑问句；肯定句中用may。

举一反三

—The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job?
—____ my students have a try?

A．Shall

B．Will

C．Could

D．Should

题型：不详难度：| 查看答案

I ____ you, but I didn’t think you would listen to me.

A．could have told

B．must have told

C．should tell

D．might rell

题型：不详难度：| 查看答案

—She joined a football team last fall and was recently made captain.
—Never _____ she"d ever have that much energy.

A．I had thought	B．I would have thought
C．could I have thought	D．will I have thought

题型：不详难度：| 查看答案

—You didn’t invite Mary to the ball?
—____ her, too?

A．Must I invite	B．Should I have invited
C．Must I have invited	D．Should I invite

题型：不详难度：| 查看答案

— Why didn’t you give a hand to the boy?
— I _______, but he strggled to his feet before I tried to.

A．would like to have	B．would like to
C．would rather to have	D．would better

题型：不详难度：| 查看答案