单项选择题

"______does Mr. Johnson go to London on business""At least once a month."

A．How many
B．How long
C．How often
D．How
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单项选择题
This question is too hard, and it is ______my understanding and comprehension.
A．below
B．beyond
C．over
D．without
单项选择题
Helen was much kinder to her youngest child than she was to the others, ______, of course, made the others jealous.
A．who
B．what
C．that
D．which
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