This morning the police found the car that was believed in a robbery of a city bank .A.to be usedB.to have been used 问：如果时态是一般现在时的话能选A吗
问题描述：
This morning the police found the car that was believed in a robbery of a city bank .A.to be used
B.to have been used
问：如果时态是一般现在时的话能选A吗
答
不行，因为抢劫是发生在被认为之前的在这句话中只能用B表达不定式的动作先于谓语前完成
答
不能.不定式的完成形式to have done sth,强调不定式所表示动作发生在谓语动词之前.从句意来看,be used in a robbery of a city bank就发生在find或be believed之前.所以,不管谓语动词是什么时态,该不定式短语都只能...