Question

So far, several cases of a disease,        as bird flu, are reported to have been found in the country.

A．knowing

B．to be known

C．having known

D．known

Answer 1

D

考查非谓语。know 与cases为动宾关系所以用过去分词作定语。到目前为止据知是禽流感的几个病例在这个国家被发现并报道。