How long do you think it will be ___ the bus arrives here A.

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How long do you think it will be ___ the bus arrives here A.when B.before.C.since D.after
which one is correct and reason.

题目:How long do you think it will be ___ the bus arrives here A.when B.before.C.since D.after
答案是B.
句意:你认为巴士需要多长时间才能到达这儿?
理由:首先,句中“do you think”为插入语,在具体理解句意和做题时可省略；根据句意,该句强调的是巴士到达这儿前的那段时间,因此应用“before".
不过,说实话,"when"的用法我不太清楚,见谅…

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