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section 3/1
The sale of government surplus machinery will begin at 9 a.m. and continue until the supply lasts. (A) will begin at 9 a.m. and continue until the supply lasts (B) begins at 9 a.m., continuing until the supply lasts (C) will begin at 9 a.m. and, until the supply lasts, will continue (D) begins at 9 a.m. and, as long as the supply may last, it continues (E) will begin at 9 a.m. and continue as long as the supply lasts will continue助动词不需要不出? D为什么不对,是and后面有逗号么
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