【題目】There’s no way of knowing why one man makes an important discovery ________ another man, also intelligent, fails.

A.sinceB.ifC.asD.while

【答案】D

【解析】

考查并列連詞。句意：為什么一個人會做出一個重要的發(fā)現(xiàn)，而另一個人，也很聰明，但是失敗了。A. since自從；B. if如果；C. as因?yàn)椋?/span>D. while然而。前后兩句話為兩種情況的對比，連詞while表示對比。故選D。

【知識拓展】

while的用法

while的意思有很多種，比如，當(dāng)時，同時等，但是對于上下文的不同其表達(dá)的意思不同，下面就來講解關(guān)于while連詞的六種用法：

1.引導(dǎo)時間狀語從句

譯作“當(dāng)……時”。例如：Make hay while the sun shines.趁著有太陽曬曬草。(乘機(jī)行事，抓緊時機(jī)。)

2.引導(dǎo)讓步狀語從句

常放在句首，譯作“盡管”、“雖然”，比although或 though語氣要輕。例如： While I believe it is true, I cannot prove it.雖然我相信那是真的，但我無法證明。

3.引導(dǎo)條件狀語從句

相當(dāng)于as long as，譯作“只要”。例如： While there is life, there is hope.有生命，就有希望。

4.引導(dǎo)原因狀語從句

相當(dāng)于since， 有“既然”的意思。例如：You'll never save any money while you're so extravagant.

你這么奢侈，永遠(yuǎn)存不下錢來。

5.連接并列句

表示對比，相當(dāng)于whereas，譯作“而”、“可是”。例如：Motion is absolute while stagnation is relative.

運(yùn)動是絕對的，而靜止是相對的。

6.連接并列句

表示遞進(jìn)，相當(dāng)于and what is more, 譯作“并且”、“而且”。例如： Of course, I resolutely determined not to marry, while I quite forgot to consider at all that great rock of disaster in the working-class world-- sickness.當(dāng)然, 我下定決心不結(jié)婚，而且把工人階級的巨大災(zāi)難——疾病，也忘得一干二凈。

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