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(  )16.It is known to all that_____you exercise regularly,you won’t keep good health.

A.Unless

B.whenever

C.although

D.if

16.A【解析】unless“除非,如果不”;whenever“无论何时”;although“虽然,尽管”;if“如果,假如”。句意:众所周知,如果你不经常锻炼,你就不会保持健康。故选A。

(  )17.My brother would like to buy a good watch but_____was available from that shop.

A.Nothing

B.none

C.no one

D.neither

17.B【解析】句意:我的哥哥想买一个好表,但是那个商店里没有合适的。none表示所有的都不,既可指人,也可以指物;no one相当于no body,只能指人。故选B。

(  )18.He can’t remember when_____turning point occurred exactly,but it might be_____morning during his vacation.

A./;a

B.a;a

C.the;a

D.a;the

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