418．--- Would you have called her up had it been possible?

　　--- Yes, but I

　　busy doing my homework.

　　A．was B．am C．had been D．would be

　　A考查动词时态。句意：过去我正在做功课。

　　419. Unexpected difficulties ____in the course of their experiment.

　　A. arises

　　B. were arising

　　C. arose

　　D. were arisen

　　C考查动词时态。根据in the course of their experiment可知用一般过去时。

　　420．--- Do you think we should accept that offer?

　　--- Yes, we should, for we

　　such bad luck up till now, and time

　　out.

　　A．have had; is running B．had; is running

　　C．have; has been run D．have had; has been run

　　A考查动词时态。第一空由up till now可知用现在完成时；第二空用进行时表将来时。

　　421．By the time he realizes he

　　into a trap, it’ll be too late for him to do anything about it.

　　A．walks B．walked C．has walked D．had walked

　　C考查动词时态。句意：直到他意识到他已经走进圈套时，他再做什么都晚了。

　　422．This is the first time we

　　a film in the cinema together as a family.

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