题文
—Do you know ______?—Yes. She is doing her homework.
| A．what is your sister doing | B．what your sister is doing |
| C．when your sister is doing homework | D．where is your sister doing homework |
—Do you know ______?—Yes. She is doing her homework.
| A．what is your sister doing | B．what your sister is doing |
| C．when your sister is doing homework | D．where is your sister doing homework |
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