457.The careless driver is ________ for the traffic accident that _______ yesterday.
A.to blame;happened
B.to blame;was happened
C.to be blamed;was happened
D.to be blamed;happened
458.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
457.答案是A;be to blame应受责备。注意:此短语无被动。
458.答案是A;考查动词的时态在具体语境中的应用。此处but之后为过去的真实情况，所以应选用过去时。
