Sensory cells______impulses by producing electrical signals.

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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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托福（TOEFL）

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