there a lot of rubbish on the floor so i asked maer to sweep up

a were it b are them c was it d is them

C

asked,所以是过去式 垃圾不可数,所以用was
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第1个回答  2012-05-31
选C, rubbish不可数。用it作替代,代词放在词组sweep 和up 中间