| —What were you doing _________your mother was cleaning up the room? |
| —I was reading a book. |
|
[ ] |
A. until
B. if
C. while
D. though |
|
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与“—What were you doing _________your mother was cleaning up the room?—I was reading a book.[ ]A. until B. ifC. whileD. though”考查相似的试题有：
