we look forward with great interest ( )your letter again填什么,receive的一种形式
问题描述：
we look forward with great interest ( )your letter again填什么,receive的一种形式
答
we look forward with great interest (to receiving )your letter again
我们怀着极大的兴趣,期待再收到你的信.
丢了个to我还以为要考非谓语动词呢，结果这么简单是非谓语啊，look forward to doing sth动名词形式也是非谓语形式的一种。