题目列表(包括答案和解析)
The number of trees that ________ cut down ________ 3000 last year.
[ ]
The number of trees that ________ cut down ________ 3000 last year.
[ ]
The number of trees that ________ cut down ________ 3000 last year.
A.were; were
B.was; was
C.was; were
D.were; was
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