Question

(2013·成都一診)Parents are doing all they ________ to help their children achieve their ambitions.

A．shall　　　　　　　　　B．can

C．may D．need

 

Answer 1

B

【解析】選B　考查情態(tài)動(dòng)詞。句意：父母們?cè)谧鏊麄兞λ�能及的事來幫助他們的孩子�?shí)現(xiàn)他們的夙愿。完整形式為“Parents are doing all they can do to help their children achieve their ambitions.”其中they can do是定語從句，修飾先行詞all; to help their children achieve their ambitions是目的狀語。由于主句中出現(xiàn)了實(shí)義動(dòng)詞doing，所以省略了從句中的do。故答案為B。