We are looking forward to (receive) ______ your letter again.

admin2015-04-17  35

问题 We are looking forward to (receive) ______ your letter again.

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答案receiving

解析 在短语look forward to中,to是介词,所以应接动名词形式,即receiving。注意,要和to do不定式中 to后面加动词原形区分开来,避免在做题时误选。
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