题干
English is very important, so I practice ________ it very hard.
A：speaks
B：to speak
C：speaking
D：speak
答案(点此获取答案解析）
C
English is very important, so I practice ________ it very hard.
A：speaks
B：to speak
C：speaking
D：speak
，
，
，
，
中，无理数的个数是（ ）
