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情态动词和虚拟语气1.—How did you do in the test? —Not so well.I ________ much better but I misread the directions for writing. A．will have done B．could have done C．must have done D．may have done 答案 B [but所表达的是一种含蓄条件，由其后的过去时态可知此处该用“could＋完成时”的虚拟形式。] 2．She quickened her pace in order that she ________ with the others. A．may catch up B．might catch up C．could have caught up D．might have caught up 答案 B [这是目的状语从句，由主句的过去时态可知此空该用情态动词的过去时。] 3．If it were not for the fact that she ________ sing, I would invite her to the party. A．couldn't B．shouldn't C．can't D．might not 答案 C [“她不能唱歌”是一客观事实，所以用现在时。] 4．—You didn't wait for Mr.Black last night, did you? —No, but we ________.He didn't return home at all.A．couldn't have B．needn't have C．didn't need to D．should wait have 答案 C [needn't have done和didn't need to do的区别是：前者是虚拟语气，意为“(过去)本没必要做，但事实上却做了”；后者是陈述语气，意为“(过去)没必要做，事实上也没做”。根据语境，该选C。] | 
