患者男性，37岁。1年前因外伤性肠穿孔行肠切除加肠吻合术，半年后出现切口疝，最可能的原因是（）。

A.术后并发肠瘘

B.术后曾有腹腔内感染

C.早期活动

D.曾有切口感染

E.前列腺肥大

．—I did not know you were good friends．

—You___．I have known her since she moved here．You were abroad then．

A．may have

B．needn’t have

C．couldn’t have

D．must have