单项选择题

It took me two hours to figure out how to do it.（）

A. guess
B. sum up
C. understand
D. summarize

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单项选择题
The most prominent characteristics of handwriting are undoubtedly letter formation and slant.（）

A. presumably
B. in many cases
C. surely
D. without bias
单项选择题
These are our motives for doing it.（）

A. reasons
B. arguments
C. targets
D. pursuit
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