16.A
此题牵涉到定语从句和固定短语.
electricity ____ in our life为定语从句,修饰先行词the part.
将先行词the part放入定语从句中,则为：electricity ___ the part in our life.
固定短语：play ...part in sth,意思是“起到...作用”.
所以答案为 A plays.
16.A
此题牵涉到定语从句和固定短语.
electricity ____ in our life为定语从句,修饰先行词the part.
将先行词the part放入定语从句中,则为：electricity ___ the part in our life.
固定短语：play ...part in sth,意思是“起到...作用”.
所以答案为 A plays.