5．I __________my new mobile phone for several weeks；however，I'm still not familiar with all of its functions．（　�。�
A．have been usingB．had been usingC．usedD．had used

分析 我使用我的新手機幾周了；然而，我還是不熟悉它所有的功能．

解答 答案：A 考查時態(tài)辨析．根據(jù)下文"我還是不熟悉它所有的功能"，表示一直使用到了現(xiàn)在，要用現(xiàn)在完成時行時態(tài)．B項是過云完成進(jìn)行時態(tài)，本題中并沒有表示過去的時間；C項是一般過去時態(tài)，同樣沒有表示過去的時間；D項是過去完成時態(tài)，同樣沒有表示過去的時間．

點評 解答此類問題要了解各種時態(tài)的基本含義，并區(qū)別各種時態(tài)之意的差異，了解某些時態(tài)在特定的時間上的用法，然后結(jié)合語境選擇正確答案．

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