You should have put the milk in the ice box. I expect it ___undrinkable by now.

题型：不详难度：来源：

A．became

B．had become

C．has become

D．becomes

答案

解析

指从过去一直延续到现在的状况。

举一反三

－How much shall I pay for the phone call?
－You __________. This is free of charge.

A．shouldn’t

B．can’t

C．needn’t

D．mustn’t

题型：不详难度：| 查看答案

---- There is a lot of smoke coming out of the teaching-building there.
---- Really? It _____ be a fire, most probably.

A．can

B．ought to

C．have to

D．must

题型：不详难度：| 查看答案

Look at the floor , Tom ! _____you watch TV while having a meal?

A．Should

B．Could

C．Would

D．Must

题型：不详难度：| 查看答案

The fire spread through the hotel very quickly, but everyone __________ get out.

A．had to

B．would

C．could

D．was able to

题型：不详难度：| 查看答案

---Did you visit the famous museum ?
　 ---No. We ______ it. But we spent too much time shopping.

A．can"t have visited	B．could have visited
C．must have visited	D．shouldn"t have visited

题型：不详难度：| 查看答案