【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)為還要有多久中國才能發(fā)射另一個載人飛船這里do you think 是插入語,這句話用了固定句型:It will be + 一段時間 + before…,要多久才…,since也可以和一段時間連用,但是句型是:It is/has been + 一段時間 + since,故選B。

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