问题补充:
单选题Aboutsixmonthslater,thelettertheywerelookingforwardto________atlast.A.arrivedB.arrivingC.had arrivedD.arrive
答案:
A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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