Look,Mary______under the lamp.A:is writing letter to my auntB:is doing her homeworks应选哪个啊?还有俩个选项,但都可以排除,答案就在这俩当中,但我不知选哪一个,应是A,

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Look,Mary______under the lamp.A:is writing letter to my auntB:is doing her homeworks应选哪个啊?还有俩个选项,但都可以排除,答案就在这俩当中,但我不知选哪一个,应是A,
Look,Mary______under the lamp.
A:is writing letter to my aunt
B:is doing her homeworks
应选哪个啊?还有俩个选项,但都可以排除,答案就在这俩当中,但我不知选哪一个,应是A,

Look,Mary______under the lamp.A:is writing letter to my auntB:is doing her homeworks应选哪个啊?还有俩个选项,但都可以排除,答案就在这俩当中,但我不知选哪一个,应是A,
A
homework 没有复数的

A. do one's homework是不可数

Look,Mary______under the lamp.A:is writing letter to my auntB:is doing her homeworks应选哪个啊?还有俩个选项,但都可以排除,答案就在这俩当中,但我不知选哪一个,应是A, look look! look look look look. look look look look look look look look look look look