答案是to expect.what/how 等后面只跟不定式.此结构为宾语从句的省略形式．当宾语从句的谓语动词是want to do sth 或should do sth 时,而宾语从句的主语又是主句的主语时,可将宾语从句省略成what/which/who...to do,(此形式中do与what等是动宾形式,但不用to be done 形式）或how/where/why...to do sth．