Anna _ able to read when she was four.A:can B:could C:is able to D:were able to选哪一个

Anna _ able to read when she was four.A:can B:could C:is able to D:were able to选哪一个
Anna _ able to read when she was four.A:can B:could C:is able to D:were able to
选哪一个

Anna _ able to read when she was four.A:can B:could C:is able to D:were able to选哪一个
应该是：Anna __was__ able to read when she was four.
答案貌似都不对呀~~~~前后应该都是过去时

c be able to 的用法

was able to read
是正确的答案

was