5．While the alien _______ a souvenir，the girl called the police．（　　）
A．was buyingB．boughtC．buysD．is buying

分析 句意：當(dāng)艾倫正在購買紀(jì)念品時，就在那個時刻有個女孩報了警．

解答 答案：A．while一般情況下引導(dǎo)過去進(jìn)行時，即主語+was/were+Ving，常接延續(xù)性動詞．根據(jù)句意，the girl called the police，此事發(fā)生在過去，while在這里表示同時進(jìn)行的動作，故用過去進(jìn)行時．

點評 此題考查while在引導(dǎo)時間狀語從句過去進(jìn)行時態(tài)時的用法．

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