Show tune that ends: "Oh, can't you see / How happy we would be?” (3,3,3)

I believe the answer is:

tea for two

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If this is the answer, I'm afraid I cannot explain it.

(Other definitions for tea for two that I've seen before include "Musical number" , "Air" , "Popular 1925 song (for afternoon drinking companions?)" , "Song from musical No, No, Nanette" .)

I've seen this clue in The Times.

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