问题
选择题
About six months later，the letter they were looking forward to ________at last．
A．arrived
B．arriving
C．had arrived
D．arrive
答案
答案：A
考查动词时态。look forward to中的to是介词，而不是不定式符号，所以后接动词作宾语时，要用动名词，而不用动词原形。
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