情态动词和虚拟语气
(共3组，每组限时8分钟)
[一模题组]
1．(2013•成都一诊)parents are doing all they ________ to help their children achieve their ambitions.
a．shall b．can
c．may d．need
解析：选b 考查情态动词。句意：父母们在做他们力所能及的事来帮助他们的孩子实现他们的夙愿。完整形式为“parents are doing all they can do to help their children achieve their ambitions.”其中they can do是定语从句，修饰先行词all; to help their children achieve their ambitions是目的状语。由于主句中出现了实义动词doing，
