参与胸腺嘧啶核苷酸合成的维生素是（）
A.维生素K
B.维生素C
C.叶酸
D.维生素A
E.B族维生素
参考答案：C
Mr. Green has never smoked any more since his wife _____ him to give it up.
A．persuaded
B．wanted
C．advised
D．suggested
