选B,homework 是个单量,用单数动词,has .然后这是一个被动语态,所以用has been.
由此答案选B
Three-fourths of the homework [ ]today.
Three-fourths of the homework [ ]today.
A;has finished
B;has been finished
C;have finished
D;have been finished
必须有理由
A;has finished
B;has been finished
C;have finished
D;have been finished
必须有理由
英语人气：628 ℃时间：2020-04-15 11:03:35
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