敏感因素对项目经济评价指标产生（）时，会给项目带来较大风险。

A.正弱敏感

B.负弱敏感

C.正强敏感

D.负强敏感

He ran quickly all the way to school, ______ he was still late.

A．but

B．and

C．or

D．so