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

问题描述:

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

was

was able to read
是正确的答案

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