do you have a lot of homework at the weekend yes ,we do .and sometimes___very hard.a)they are

问题描述:

do you have a lot of homework at the weekend yes ,we do .and sometimes___very hard.a)they are
b)its c)i am d)it is

答案:D it is
解释:前面的homework 是不可数名词,用it指代.
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