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【題目】The tiger is now in danger of disappearing. So more attention ____ to protecting the tiger.

A. paid B. must pay

C. was paid D. must be paid

【答案】D

【解析】試題分析：句意：老虎現(xiàn)在有消失的危險。所以必須更多關注保護老虎。根據句意及題干分析此空應用被動語態(tài)，其基本結構是be+動詞的過去分詞，答案C只是指過去關注，所以排除，故選D。

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