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