单项选择题
Why not （） to Professor Smith for advice？ He is an expert in this field.
A.go B.your going C.to go D.you go
单项选择题 Wehadapartylastmonth，anditwasalotoffun，solet’shave（）onethismonth.
单项选择题 Numerousstudieshaveshownthat（）theteacher’sexpectation，thegreatertheachievementofthestudent.
单项选择题 Mychildrenarelookingforwardto（）atriptoBeijingnextmonth.
