it is +时间+since连接的一般过去时的句子 是一个固定句型,可以用瞬间动词表延续的状态.
这个句子中how long 是对上面句型 时间的提问,而do you suppose是插入语,做题时可以直接忽略.
-How long do you suppose it is ______ he arrived here?
-How long do you suppose it is ______ he arrived here?
a,after b,since
我觉得两个都可以.
a,after b,since
我觉得两个都可以.
英语人气：255 ℃时间：2020-01-25 10:14:19
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