17. Only in recent years have people become aware of the importance of environmental protection
and _____ various measures to prevent pollution from worsening.
(A) do they begin to take
(B) they begin to take
(C) began to take
(D) begun to take
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還原句子為“”People have b...
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(A) do they begin t...
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讓我們來仔細解釋每個選項： (A) d...
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