题目内容：

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？

优质解答

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.