______ until the lights have turned to green.
A．WaitB．To wait
C．WaitingD．Having waited
A
考查動(dòng)詞。本題考查祈使句，原因是每句中均包括有從屬連詞(如 when, before, until 等)，即整個(gè)句子為一個(gè)主從復(fù)合句，而所填空句仍為祈使句。故選A。句意：等待直到所有的燈都變綠。
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