【題目】We should do everything we can (protect) the birds in danger.

【答案】to protect
【解析】句意是:我們應(yīng)該做我們所能做的事來(lái)保護(hù)瀕危的鳥兒。此處用動(dòng)詞不定式作目的狀語(yǔ),故填 to protect。

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