女性，44岁。2年前因升结肠腺癌行右半结肠切除术。近期结肠镜检查发现结肠脾曲有一2cm×3cm凸向肠腔的包块，中央凹陷，边缘隆起，触之易出血。活检病理报告为结肠腺癌。根据患者情况，宜采取的治疗是（）。

A.化疗

B.放疗

C.左半结肠切除术

D.结肠癌肠段切除术

E.化疗+放疗

The weather turned out to be fine. I       the trouble to carry the umbrella with me.

A．should have taken

B．needn’t have taken

C．mustn’t have taken

D．could have taken