【题目】There _____ a lot of rubbish on the floor so I asked Mary to sweep _____ up.
A. were; it
B. are; them
C. was; it
D. is; them
在线课程【答案】C
【解析】there be 句型中 be 动词的单复数取决于其后的主语，a lot of rubbish(不可数名词)，因此 后面谓语动词要用单数。
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