doing。look forward to后面要加doing,是因為to在這里是介詞,介詞后加名詞或者是動詞的ing形式,所以是look forward to doing,意思是期盼做某事。
look forward to 后面只能跟動名詞或名詞意思和expect to do sth 一樣:
如:
I am looking forward to seeing you soon. = I expect to see you soon.
I am looking forward to your early reply. = I extpect to receive your reply
而且一般都是 be looking forward to doing sth 表示一直期待的意思
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