The boy is only five years old，but he is quite used the telephoneA. to answerB. to answe

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A. to answer
(答案→)B. to answering
C. of answering
D. by answering
解析：be ／getused to当“习惯于”讲时， to是介词，后接动名词作宾语。故该题选B。以下短语中的to为介词，后面只接动名词： lead to（导致），get down to（开始干）。