29. As we all know, the 2012 Olympic Games ______ in London, which is an ancient city.

A．are to hold

B．will hold

C．are to be held

D．are held

流行性腮腺炎的并发症有（）

A.睾丸炎或卵巢炎

B.脑膜炎或脑脊髓膜炎

C.胰腺炎

D.心肌炎

E.乳腺炎