单项选择题

To understand the situation completely requires more thought than ______. thus far.

A. has given
B. was given
C. being given
D. has been given
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单项选择题
100 yuan for this mirror! I ______ it would cost so much, said the woman in surprise.
A. know
B. hadn't known
C. don't know
D. didn't know
单项选择题
Mary has long had the desire ______ a famous writer even though the study of writing would require years of sacrifice on her part.
A. for becoming
B. to become
C. of becoming
D. becoming
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