2. 外语
  3. Last, week my brother and I decided to paint our bedroom while our parents are out for the day. Our parents usually have the 【M1

Last, week my brother and I decided to paint our bedroom while our parents are out for the day. Our parents usually have the 【M1

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问题    Last, week my brother and I decided to paint our bedroom
while our parents are out for the day. Our parents usually have the 【M1】______
painting do by a local firm, but we thought we could save some 【M2】______
money if we did ourselves. We had watched the painters the last time 【M3】______
the house was painted, but we thought we would be able to 【M4】______
do the job. "First all the surface have to be washed," my brother said. 【M5】______
"That can’t be very difficult," I replied. "We’ d better put some 【M6】______
newspapers on the carpet. If we make a mess, we’ll get into the 【M7】______
trouble." Before that had been done, we looked for some paint 【M8】______
in the garden shed. "We could use this red paint," I suggested. My
brother said that we preferred green paint. Just as we were going 【M9】______
to start, our parents arrived home. "You must have asked us first," 【M10】______
my mother said to us. "You can paint the rest of the house too!"
【M10】
选项
答案must—should
解析 该句的意思是“你们肯定先问过我们了”。must have done表示“过去一定做过某事”，should have done表示“应该做某事但实际上没有做”。根据上下文，要使用should have asked。因此，将must改为should。
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