【題目】—Did you find the missing couple in the mountain yesterday?

—No, but we __________ to get in touch with them ever since.

A. have tried B. have been trying C. had tried D. had been trying

【答案】B

【解析】句意：——你們找到了昨天在山中失蹤的夫婦了嗎？——還沒有，但是我們一直在努力與他們?nèi)〉寐?lián)系。因?yàn)閑ver since 是“自……以來”之意, 常與完成時(shí)連用，又根據(jù)but可知，現(xiàn)在仍在設(shè)法與他們?nèi)〉寐?lián)系，所以用現(xiàn)在完成進(jìn)行時(shí)。

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