Our teacher suggests English every day to improve our spoken English.A. practising to spea

问题补充：

Our teacher suggests English every day to improve our spoken English.

A. practising to speak

B. to practise to speak

C. to practise speaking

D. practising speaking

答案：

A. practising to speak

B. to practise to speak

C. to practise speaking

(答案→)D. practising speaking

解析：practise/suggest+doing，不能跟不定式；故选D。