(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”。

　　高 效 作 业

　　自我测评·技能备考

　　Ⅰ.单词拼写

　　1．I have to s__________ the pencil. It doesnt write well.

　　2．Millions will face s________________ next year as a result of the drought.

　　3．After her performance, the audience stood up and a__________ the actress for a long time.

　　4．Its widely accepted that botany falls into the

　　c_____________ of biology.

　　5．You can be paid in cash weekly or by cheque monthly; those are the two a_______________.

　　sharpen

　　starvation

　　applauded

　　category

　　alternatives

　　6．He was _____________() for murdering.

　　7．Children must learn not to ___________ ()．

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