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外语
Sensory cells______impulses by producing electrical signals.
Sensory cells______impulses by producing electrical signals.
admin
2019-07-01
36
问题
Sensory cells______impulses by producing electrical signals.
选项
A、respond to
B、to respond
C、responding
D、by responding
答案
A
解析
Respond to is a verb + preposition structure. Respond must be followed by to because there is a noun object, impulses.
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