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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(答案→)A. to has e
B. to have e
C. to having e
D. has e
解析：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。