—Robert speaking. Could you get me through to Mr. Smith in Room 501? —I'm sorry, he isn't here. He _______ this mornin

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1. (2020·江苏模拟) —Robert speaking. Could you get me through to Mr. Smith in Room 501?
—I'm sorry, he isn't here. He _______ this morning.

A . checked in B . dropped in C . checked out D . dropped out

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