1．________ occurred to me that I had left my shirt on the playground.
A．It B．One C．That D．What
【答案】A
【解析】考查固定句式。句意：我突然想起我把衬衫忘在操场上了。固定句式：It occurred to sb. that…意为“某人突然想起……”。故选A。
2．_______ is known to us all that the old scientist, for _______ life was hard in the past, still works hard in his eighties.
A．As; whose B．It; who C．As; whom D．It; whom
【答案】D
【解析】考查主语从句和定语从句。句意：众所周知，这位年老的科学家，过去他的生活很艰难，在他八十多岁时仍然努力工作。It is known to us all that是个固定句型，意思是“众所周知”，这里it是形式主语，真正的主语是that引导的主语从句，如果用as的话，as is known to us all后面要用逗号与后面的句子隔开，没有that；第二空中句子包含一个“介词+关系代词”引导的定语从句，指人，只能用whom，故选D。
