We entered the café and sat down by the window, waiting ________.
A．to serveB．to be served
C．servingD．served
B
答案：B　考查非謂語動(dòng)詞。根據(jù)句意，句子主語We與非謂語動(dòng)詞serve之間存在被動(dòng)關(guān)系，且serve的動(dòng)作尚未發(fā)生，故使用不定式的被動(dòng)形式。
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