A:x='0'
B:x=1
C:x=0或x='1'
D:x=0或x=﹣1
看拼音,写汉字。
wǔ dǎo qīng tíng yīn fú guāng cǎi duó mù
____ ____ ____ ____
—Who taught Zhu Zhiwen to sing? —________! He learned singing by himself.