【lest,incase,forfearthat虚拟语气后从句用should/would/could/might+do的区别Whilecrossingthemountainarea,allthemencarriedgunslestthey__bywildanimals.wouldbeattracked/shouldbeattrackedTmadmanwasputinthesoft-padded】

　　lest,incase,forfearthat虚拟语气后从句用should/would/could/might+do的区别

　　Whilecrossingthemountainarea,allthemencarriedgunslestthey__bywildanimals.

　　wouldbeattracked/shouldbeattracked

　　Tmadmanwasputinthesoft-paddedcelllesthewouldinjurehimself.(1997.12.CET4)

　　这题A.injure为什么不行

　　有语法书上说lest,incase,forfearthat虚拟语气后从句用shoulddo,incase后should不可省,lest,forfearthat后should可省