单项选择题

Next semester, Susan must take three compulsory courses.

A. formal
B. voluntary
C. practical
D. required
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In the first decades of this century, the individual gene could be worked with fruitfully.
A. blindly
B. completely
C. productively
D. carefully
单项选择题
Even the best - build machine will not run forever without proper maintenance.
A. eternally
B. smoothly
C. dependably
D. accurately
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