12．I ordered a drink while I______ for my friends to come．（　　）
A．will waitB．am waitingC．would waitD．was waiting

分析 在等朋友來的時候我點了一杯喝的．

解答 答案：D
while表示"當(dāng)…時候、在…期間"，表示一個時間段，根據(jù)句意可知，在這期間我一直在等朋友，故需要進(jìn)行時；另外結(jié)合ordered可知，是發(fā)生在過去的事情，故用過去進(jìn)行時，即答案為D．

點評 考生在答題時能根據(jù)具體語境推測出所需時態(tài)，另外要結(jié)合所給句子的時態(tài)．

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