2. 外语
  3. Sensory cells______impulses by producing electrical signals.

Sensory cells______impulses by producing electrical signals.

admin2019-07-01  43
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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