Professor Tu Youyou never stops doing research on Chinese medicine，______？（ ）
| A． |
is she |
B． |
does she |
| C． |
isn't she |
D． |
doesn't she |
Professor Tu Youyou never stops doing research on Chinese medicine，______？（ ）
| A． |
is she |
B． |
does she |
| C． |
isn't she |
D． |
doesn't she |
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