It ________ some time _________ I realized the truth.
A.was; beforeB.is; before
C.has been; untilD.has been; after
A

試題分析:考查固定句型:It was+一段時間+before…,要多久…就(才)…,句意:過了一段時間我才意識到真相。選A。
點評:固定句型:It was+一段時間+before…,要多久…就(才)…,容易混淆的句型是it is/has been 一段時間since從句(過去時);自從…以來,已經(jīng)有一段時間了。
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