1.Helping others is a habit,__________you can learn even at

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1.Helping others is a habit,__________you can learn even at an early age.
A.it
B.that
C.what
D.one
2.The country has already sent up three unmanned spacecraft,the most recent ______at the end of last March.
A.has been launched
B.having been launched
C.bing launched
D.to be launched
3.--I'm sorry I broke the vase
--Oh,_______.It wasn't very expensive.
A.you'd better not
B.I'm afraid not
C.as you wish
D.that's all right
4.Knowing office rules--whether _______or not--is critical,especially for young job seekers.
A.written
B.writing
C.being written
D.having been writte,
5.______to too much sunlight,as is generally considered,will add to the potential of catching skin cancer.
A.Being exposed
B.Exposed
C.Exposing
D.To expose

都是瞎推荐,哎.
更正被推荐答案第一题!
1.D
one是a habit的同位语,而后面的you can learn even at an early age为省略关系代词that的定语从句.
其中关系代词that代替先行词one,在定语从句中充当learn的宾语,所以可以省略.
2.B
逗号前后部分主语不同,但是之间又没有连词and等引导,说明后面部分是独立主格结构.
考查独立主语the most recent (unmanned spacecraft)和非谓语动词launch之间为被动关系,且launch该动作已经发生,所以用having been done结构.
3.D
前面有I'm sorry,所以用That's all right回答,其意思是“没关系”.
4.A
此题考查状语从句的省略,即：
whether written or not = whether (office rules are) written or not
很明显被省略的主语office rules和write之间为被动关系,所以用其过去分词.
5.A
选项做句子主语,所以用动名词或不定式结构,排除B；
句意明显为被动,排除主动结构的CD.
A为动名词的被动结构,做该句的主语.

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