请说明下语法或原因theboywantedtoridehisbike,buthismothertoldhim)我觉得没答案啊这题a:nottob:nottodoc:notdoitd:donottoshecan'thelp)thehousebecauseshe'sbusymakingacakea:tocleanb:cleaningc:tocleanedd:to

　　请说明下语法或原因

　　theboywantedtoridehisbike,buthismothertoldhim)我觉得没答案啊这题

　　a:notto

　　b:nottodo

　　c:notdoit

　　d:donotto

　　shecan'thelp)thehousebecauseshe'sbusymakingacake

　　a:toclean

　　b:cleaning

　　c:tocleaned

　　d:tocleaning

　　thethiefstoleintothehouse,)bytheowner

　　a:onlytobecaught

　　b:onlybeingcaught

　　c:havingbeencaught

　　d:caught

　　)ateacher,weshouldsetagoodexampletostudents

　　a:being

　　b:having

　　c:tobe

　　d:tohavebeen