【題目】Since the time humankind started gardening, we _ _ to make our environment more beautiful.

A. try B. have been trying

C. are trying D. will try

【答案】B

【解析】

試題分析：句意：自從人類開始有園林藝術(shù)，我們就一直努力讓環(huán)境更美。根據(jù)時(shí)間狀語“Since the time humankind started gardening”，意為“自從人類開始有園林藝術(shù)”，說明“我們努力讓環(huán)境更美”的行為從過去一直持續(xù)到現(xiàn)在，用現(xiàn)在完成進(jìn)行時(shí)，故選B。

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