5．-Where are you going for your holidays？
-Well，we ________ yet．（　　）
A．don't decideB．haven't decidedC．didn't decide

分析 --你們打算去哪里度假？
--哦，我們還沒決定呢．

解答 答案：B．
根據(jù)we ________ yet，可知這里yet的意思是還，它一般用于現(xiàn)在完成時的否定句當(dāng)中，所以可以判斷這個句子的時態(tài)應(yīng)該是現(xiàn)在完成時，構(gòu)成：have/has+動詞過去分詞．故選B．

點(diǎn)評 本題考查了現(xiàn)在完成時的用法．解答時注意yet的用法以及現(xiàn)在完成時的構(gòu)成形式．

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