【題目】It is high time that we(concentration) on protecting the environment.

【答案】concentrated/should concentrate
【解析】句意：到時間我們要關(guān)注于保護環(huán)境的時間了。It is high time that...屬于虛擬語氣謂語動詞用動詞過去時或者should+動詞原形。故填concentrated/should concentrate。

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