He came back late, _____ which time all the guesses had already left.
A．byB．a(chǎn)tC．duringD．a(chǎn)fter
A
介詞辨析.在表示時間時,by在……之前；at表示在具體時刻；during表示在……期間；after表示在……之后。句意：他回來晚了，在那之前客人們已經(jīng)離開了。選A。
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