In the future, senior citizens will be able to go anywhere using high-tech cameras _______ to their head.
A．a(chǎn)ttachingB．a(chǎn)ttachedC．to attachD．a(chǎn)ttaches
B
考查非謂語動詞用法。Camera與attach構(gòu)成被動關(guān)系，使用過去分詞。
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