电子虽小，但它们在形成电流方面发挥了重要作用。Small（）electrons are， they play an important role in the formation of electric current.
电子虽小，但它们在形成电流方面发挥了重要作用。Small（）electrons are， they play an important role in the formation of electric current.
A.even though
B.no matter how
C.as
D.while
正确答案：as