问题补充：
With so many exercises ， the students are having a hard time.
A. finished
B. finishing
C. to finish
D. being finishing
答案：
A. finished
B. finishing
(答案→)C. to finish
D. being finishing
解析：C考察非谓语动词。句义：有那么多的作业要做，学生们日子不好过，这里的不定式充当with复合结构中的宾语补足语。表示finish动作还没有发生。A项表示已经完成，B项表示正在进行。
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