单项选择题

Although ______ Spanish, he attended the tutorial course.

A. he was knowing
B. he is knowing
C. having a knowledge of
D. knows
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This new laser printer is ______ with all leading software.
A. comparable
B. competitive
C. compatible
D. cooperative
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Professor Smith and Professor Brown will ______ in presenting the series of lectures on American literature.
A. alter
B. alternate
C. substitute
D. exchange
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