I was doing my homework ________ the door bell rang. [
| I was doing my homework ________ the door bell rang. |
| [ ] |
| A.while B.when C.after D.before |
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你能帮帮他们吗
| I was doing my homework ________ the door bell rang. |
| [ ] |
| A.while B.when C.after D.before |
你能帮帮他们吗