1.The letter that I was looking forward to ____ at last.
A.coming B.came C.come D.being come
2.How about the two of us ____ a walk down the garden?
A.to take B.take C.taking D.to be taking
我资质较低,请细致讲解原由,并说明每个选项
答案是BC
我想知道原由
为什么第一题come不行
两个空都是谓语为什么一个是过去式一个是动名词
请帮我解释下