单项选择题

No one doubts ______ it is true or not.

A．whether
B．if
C．that
D．what
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单项选择题
The book is on the top shelf and is out of ______ .
A．distance
B．reach
C．hand
D．attempt
单项选择题
His brother had become a teacher, ______ he wanted to be.
A．who
B．what
C．which
D．that
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