We set off early next morning and came to unknown valley after about an hour.A. the; the

We set off early next morning and came to unknown valley after about an hour.
A. the; the
B. the; an
C. /; a
D. /; the

A. the; the(答案→)B. the; anC. /; aD. /; the解析：考查冠词。句意我们第二天造成早早地出发了，在大约一小时后到了一个不知名的山谷。结合语境可知前文特指某个早晨，下文泛指任何一个不知名的山谷，故选B。

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