There's no way of knowing why one man makes an important discovery ________ another man, also intelligent, fails.
| A．since | B．if |
| C．as | D．while |
相关试题
—Do you think we are going the right way to the Forbidden City?
—Sorry, I’m not sure．But it _______ be．
| A．might | B．will | C．must | D．can |
The reason for his
success is ______ he worked very hard.
| A．why | B．that | C．whether | D．how |
Word came _______ the students would put off the outing until next week, when they wouldn’t be busy.
| A．that | B．when | C．which | D．whether |
He ______ at once when I promised t
o help him.
| A．cheered up | B．gave up | C．broke up | D．turned up |
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