单项选择题

Professor White, I would feel very ______ if you could give some advice about my thesis.

A．honorable
B．appreciable
C．obliged
D．relieved
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单项选择题
Although some students graduate from junior high school, they are ______ illiterate, never having learned to read or write well.
A．gradually
B．virtually
C．continually
D．internally
单项选择题
Students who have registered for this course must take performance tests at monthly ______.
A．gaps
B．standard
C．length
D．intervals
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