单项选择题

It must have rained last night, () the ground is wet.

A. because    
B. as     
C. since   
D. for

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单项选择题
It was for this reason () she left her homeland and moved to a mountain village.

A. why                    
B. for 
C. which 
D. that
单项选择题
()more attention, the young trees could have grown much letter.

A. To give
B. Given
C. Giving
D. Having given
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