Everyone should be able to do ________ they can to make their company bigger．
A.whatB.thatC.whereD.how在线课程A
句意为“每一个人都应该竭尽所能地使他们的公司做大”。what they can是what they can do的省略形式。基本句式为“sb．do what sb．can(do)to do sth．”，本句型中，what引导的句子作be able to do的宾语；to make their company bigger作目的状语；what相当于all that，所以答案选A。