患儿，3岁，出生时曾接种卡介苗，2岁半时PPD试验为6mm×6mm，最近PPD试验为15mm×16mm，下列哪种情况可能性较大（）

A.卡介苗接种后反应

B.曾有结核感染

C.新近有结核感染

D.假阳性反应

E.皮肤激惹反应

---Hi, Tracy, you looked tired.

---I am tired. I______the living room all day.

A．painted

B．had painted

C．having been painting

D．have painted