----,i think,and the problem could be settled.___,I think ,and the problems could be settled.A.So long as you keep spirits B.If you don't double your efforts C.Making great efforts D.A bit more efforts选D,

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----,i think,and the problem could be settled.___,I think ,and the problems could be settled.A.So long as you keep spirits B.If you don't double your efforts C.Making great efforts D.A bit more efforts选D,
----,i think,and the problem could be settled.
___,I think ,and the problems could be settled.
A.So long as you keep spirits
B.If you don't double your efforts
C.Making great efforts
D.A bit more efforts
选D,

----,i think,and the problem could be settled.___,I think ,and the problems could be settled.A.So long as you keep spirits B.If you don't double your efforts C.Making great efforts D.A bit more efforts选D,
后面有and,前面需要一个祈使句,D的名词形式就相当于祈使句

名词短语作状语，相当于一个祈使句：.Make great efforts ,I think ,and the problems could be settled.
and连接两个并列句，前一句不用任何引导词（if,when等），故AB项都不正确
and连接两个并列句也不能与分词连用，故C项不正确
选D

ABC不可以
后半句主语是The problems
你选ABC首先主语不一致
D实际是省略，If we made A bit more efforts ,the problem could be settled

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