He was ______ by his colleagues though he himself didn't think he had done anything

special. [ ]

A. thought little of

B. thought poorly

C. thought highly of

D. thought highly

某工程的双代号时标网络图如下图所示，请回答下列问题。

根据题意，回答下列问题：

该工程项目的关键线路为（）。

A．①—④—⑥—⑦—⑧

B．①—②—③—⑥—⑦—⑧

C．①—③—⑥—⑦—⑧

D．①—②—⑤—⑦—⑧