【題目】How long do you think it will be ________ China sends another manned spaceship?

A. that B. before C. since D. when

【答案】B

【解析】

考查常見句型。句意：你認(rèn)為還要有多久中國(guó)才能發(fā)射另一個(gè)載人飛船？這里do you think 是插入語(yǔ)，這句話用了固定句型：It will be + 一段時(shí)間 + before…，要多久才…，since也可以和一段時(shí)間連用，但是句型是：It is/has been + 一段時(shí)間 + since，故選B。

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