Mother blamed the dog for breaking the glass but in fact I .A. was to be blamedB. is to b

问题补充：

Mother blamed the dog for breaking the glass, but in fact I .

A. was to be blamed

B. is to be blamed

C. was to blame

D. is to blame

答案：

A. was to be blamed

B. is to be blamed

(答案→)C. was to blame

D. is to blame

解析：考查时态。be to blame应该受到责备。根据句意用一般过去时。句意：母亲指责狗打破了杯子，但事实上我应该对此负责。