-- How long do you think it will be ______ the bus arrives here?
-- No more than five minutes.
A．when B．beforeC．since D．a(chǎn)fter
B

試題分析：考查句型：It will + 一段時(shí)間+ before…，要多長(zhǎng)時(shí)間才…,句意：你認(rèn)為還要多久公共汽車才能到？--不到5分鐘。選B。
點(diǎn)評(píng)：固定句型：It was+一段時(shí)間+before…，要多久…就（才）…，容易混淆的句型是it is/has been 一段時(shí)間since從句（過去時(shí)）；自從…以來，已經(jīng)有一段時(shí)間了。
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