His mother is deaf so she has to use a hearing .A.helpB.machineC.aidD.assistant
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His mother is deaf so she has to use a hearing ________.
A.help
B.machine
C.aid
D.assistant
试题答案
C
解析：题意：他妈妈聋了，所以得用助听器。aid此处意为"辅助性的工具"。