— How long will it be _______ the president pays another visit to China?
— It all depends.
A．beforeB．untilC．sinceD．when
A
固定句型。It be一段時間before從句，意為：— 一段時間以后某事才發(fā)生。句意：多久以后總統(tǒng)才會再一次訪問中國？—看情況而定。
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