—__________ do I have to change the robot’s batteries? —Every two months.
A．How longB．How soonC．How oftenD．How many
C
本題的回答語(yǔ)意思為每?jī)蓚�(gè)月，表示的是頻率，對(duì)此提問(wèn)應(yīng)該用how often，故選C,how long對(duì)長(zhǎng)度提問(wèn)，how soon對(duì)多久以后提問(wèn)，how many對(duì)可數(shù)名詞數(shù)量提問(wèn)。
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