问题补充:
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. arrived
B. arriving
C. had arrived
D. arrive
解析: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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