17．Make sure you have checked the information in the passage       you make the choice．（　　）
A．afterB．sinceC．whileD．before

分析 在你做選擇之前，要確保你已經(jīng)核對了這一頁上的信息．

解答 答案：D．根據(jù)Make sure you have checked the information in the passage可知核對了這一頁上的信息要發(fā)生在you make the choice（做選擇）之前，所以答案是D before"在…之前"．其他選項的含義分別是A"在…之后"；B"自從"；C"當(dāng)…時候，然而"．

點(diǎn)評 考查從屬連詞．before的固定句型：
1．用于句型"it was not long+時間段+before …"意為"不久就…．"
It was not long before he sensed the danger of the position．
2．用于句型"it will be（not ）+時間段+before…．"表示"要過多久/不久…才…"
It will be half a year before you graduate from this school．
It will be not long before you find you are wrong．

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