So far, several cases of a disease,        as bird flu, are reported to have been found in the country.
A．knowingB．to be knownC．having knownD．known
D
考查非謂語。know 與cases為動(dòng)賓關(guān)系所以用過去分詞作定語。到目前為止據(jù)知是禽流感的幾個(gè)病例在這個(gè)國家被發(fā)現(xiàn)并報(bào)道。
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