单项选择题

Although there are many predictions about the future, no one knows for sure ______ the world would be like in 50 years.

A. how
B. that
C. which
D. what
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单项选择题
He is in trouble now and he has ______ 200 Yuan left in his pocket.
A. nearly
B. completely
C. merely
D. identically
单项选择题
______ I admit that the problems are difficult. I don' t agree that they cannot be solved.
A. When
B. Where
C. While
D. Why
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