动词的时态与语态
1． —________that company to see how they think of our product yesterday?
—Yes. They are happy with it.
A．Did you call B．Have you called
C．Will you call D．Were you calling
2． In the 1950s in the USA, most families had just one phone at home, and wireless phones ________ yet.
A．haven't invented B．haven't been invented
C．hadn't invented D．hadn't been invented
D 考查动词的时态和语态。 首先无线电话是被发明的， 所以排除 A和 C, 另外通过时间状语in the 1950s, 可知时态为过去完成时，故答案为D。句意：20世纪50年代的美国，大多数家庭只有一部电话，无线电话那时还没有被发明出来。
3． People ________ better access to health care than they used to, and they're living longer as a result.
A．will have B．have
C．had D．had had
B 考查动词的时态。句子是在描述现在的医疗便捷，表达的是现在的状态，所以应该用一般现在时，故答案选 B。句意：人们现在有权使用比过去更好的医疗服务，所以人们更长寿了。
4． He hurried home，never once looking back to see if he ________．
A．was being followed B． was following
C．had been followed D．followed
A 考查动词的时态和语态。根据题意可知，此处应该是他“被跟踪”，动词follow与主语he之间构成被动关系，又因为hurried是过去式，故用过去进行时的被动语态，故选A项。句意：他匆忙赶回家，从来没有回过头去看看他是否被跟踪。