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：本题考查谓语动词。句中we have been looking forward to我们一直所期望的，作the holiday的定语，故整个句子应当为The holiday has e at last。句意：我们是多么的快乐啊！我们一直所期望的加强终于来了。