How happy we are! The holiday we have been looking forward ________at last.
A.to has e
B.to have e
C.to having e
D.has e
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A解析试题分析：考查词组和时态：句意：我们多么高兴啊！我们盼望的假日终于到了。Look forward to“盼望”to不能少，we have been looking forward to是定语从句修饰the holiday，这句话还缺少谓语，用现在完成时。选A。考点：考查词组和时态点评：这道题是易错题,考生容易错选成C，以为是look forward to doing这个词组，其实这句话的look forward to 的宾语是the holiday，考生要根据句子成分判断，也要结合上下文句意判断。