能杀灭一切微生物，达到灭菌水平的化学灭菌剂为（）

A.环氧乙烷

B.含氯消毒剂

C.氯己定碘

D.氯己定

E.苯扎溴铵

---Which of the following sentences is CORRECT?

A．I don’t know when will he come back tomorrow.

B．I have no idea when will he come back tomorrow.

C．I don’t know when he will come back tomorrow.

D．I have no idea when is he coming back tomorrow.