一道英语的单项选择.

A
change into something 变成什么

例如：When water is heated, it will change into vapor. 水被加热， 就会变成蒸汽

into

a
change into...变成什么

选b
change to
变成

change into
v.
兑换

change for
v.
交换

A
change into something 变成什么

固定词组

Water changes _______ steam when it is boiled.
b.to c.in D.for
A