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13．Wewere planning （plan） to go to visit Xi'an when our teacher came in．

分析當我們的老師進來時，我們正在計劃去西安旅行．

解答答案：were planning 考查單詞填空．根據(jù)題干中的came可知時態(tài)是一般過去時，when引導的時間狀語從句，從句是一般過去時，主句要用過去進行時，構成是主語+was/were+doing，主語we，助動詞要用were，plan的現(xiàn)在分詞是planning，故答案是were planning

點評解答此題的關鍵是根據(jù)語境推測要填內(nèi)容表達的含義，然后能理解各選項內(nèi)容，有時可能沒有必要細細區(qū)分每個單詞的含義，僅根據(jù)句子語氣就可以判斷出正確答案．

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