they were busy working all day long. They were ___ busy working all day long. A.made B.kept C.had D.let 说明一下不选A的理由, They were made busy to work all day long. 这句子正确吗?
选A的话,则were made构成被动句式,因为在主动句式中,make/have/see/hear/watch/notice等后面都跟省略to的不定式,当在被动句式中时,不定式to要还原. 即此时,若选A的话,则应该改为they were made busy to work all day long.