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【单选题】
在文件系统中，文件的不同物理结构有不同的优缺点。在下列文件的物理结构中，不具有直接读写文件任意一个记录的能力的是______。A.
顺序结构
B.
链接结构
C.
索引结构
D.
Hash结构
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【单选题】They had no sooner arrived at the airport ________ it was time to check in. [ ]
A.
when
B.
before
C.
than
D.
though
【单选题】Which of the following contains an adverbial clause of time?
A.
No sooner had I got home than it began to rain.
B.
I do remember, now that you mention it.
C.
You'll be late unless you hurry.
D.
Much as I'd like to, I can't come.
【单选题】No sooner _______ the competition _______ _______ an unexpected accident happened.
A.
did … begin; than
B.
had … begun; when
C.
did … begin; when
D.
had … begun; than
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