回答

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(1)They have known each other for three years.
(2)The doctors have been busy since last night.
(3)This is the best Italian restaurant that I know.
(4)Where is the camera that you bought yesterday?

(3)と(4)のthatはwhichでも大丈夫です!

スヌーピー

ありがとうございます!

さくら

いえいえ!

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