题目内容：

说明原因 His friends insisted that Tony _____ n
说明原因
His friends insisted that Tony _____ nothing to do with drugs and they insistedthat he _____ free immediately.第二空为什么填be set,而不填was set?

优质解答

insist that sb should do sth (should可省略）
insist that 从句,从句必须用should+do的虚拟语气
例:
We insist that the Agreement should be signed and chopped first by them.
我们坚持合同必须由他们先签署并盖章.