1. More than 150 million chickens in the country        the bird flu so far.

(infect)

到目前為止，該國已有超過1. 5億只雞感染了禽流感。

1. have been infected by根據(jù)題意以及題干中的時間狀語so far判斷，此處謂語動詞應(yīng)用現(xiàn)在完成時的被動語態(tài)。

題目來源：高考英語組合訓(xùn)練多項選擇+完成句子 > 組合訓(xùn)練67-68

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