问答题

Worry is a great ________ of energe.

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Since all other means failed, they had to ________ to force.

单项选择题

某施工中采用了新技术，无现成定额，经专家估算，其最短、最长、最可能的施工工期分别为120D、220D、140D则工程的期望工期应为()。

A.120d
B.150d
C.180d
D.200d