(4)Ever since the Greens moved to the country a year ago, they ______ better health. A.are enjoying
Bhave been enjoying C.could have enjoyed
Dhad enjoyed
答案:B
解析:ever since (自从……以来)引导从句时,主句要用完成时态。本句强调“一直进行”,所以选B。
(5)—Did you find the missing couple in the mountain yesterday? —No, but we ______ to get in touch with them ever since. A.have tried
Bhave been trying C.had tried
Dhad been trying
答案:B
解析:从情景可知,句子的谓语应使用现在完成时态,排除C、D两项。现在完成时表示动作到现在结束;现在完成进行时则表示动作持续到现在并且要延续到将来。运用到本题表示“过去一直并且以后也要尽力去取得联系”。
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