—___________.

A.Because she become blind

B.Because she became blind

C.Because she went to the zoo

【答案】B

【解析】

句意：为什么她是伤心的？she不能用动词原形become，was说明是过去式，选项B因为她看不见了。选项C因为她去了动物园。C不符合语境，故选B。