问题
单项选择题
With a lot of difficult problems （）, the manager felt worried all the time.
A. settled
B. to be settled
C. settling
D. to settle
答案
参考答案：D
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With a lot of difficult problems （）, the manager felt worried all the time.
A. settled
B. to be settled
C. settling
D. to settle
参考答案：D