英语单选It was not until I received the SMS that I knew___a seri
英语单选 It was not until I received the SMS that I knew___a serious disease he had been suffering from,and I began to worry about___he could pull through this Christmas. A.what;whether B.how;if C.that;that D.which;how (为什么答案选A,请解释)
第一个空格是what引导的感叹句,what a serious disease he had been suffering from.而如果用How的话,句子的结构不一样,应为How serious a disease he... 第二个空格whether表示“是否”,在介词后只能用whether而不能用if.