【題目】How long do you suppose it is ______ he arrived there?

A.whenB.before

C.afterD.since

【答案】D

【解析】

考查連詞辨析。句意：你認為從她到那里到現(xiàn)在有多久了？A. when當…時；在那時；B. before在…之前；C.after …后；D.since自從，既然。since引導時間狀語從句,從句為一般過去時，主句為 it is+一段時間。故D正確。

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