快.选ABC的He started _____the piano when he was 5 years old.A .

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快.选ABC的
He started _____the piano when he was 5 years old.
A ...to play B.playing
还要加为什么的

正确答案B,理由如下:
Start to do 意思是放下一件事,开始干另外一件事.
start doing 意思是开事做某事.
一般情况下,两者可以互换.如：
He started learning /to learn English when he was only five.
他在只有五岁的时候就开始学习英语了.
但在下列三种情况下,只能用start to do sth.
(1)当主语是物而不是人时.
如：The ice started to melt.
冰开始融化.
（2）当start用于进行时态时.
如:She is starting to cook the dinner.
她开始做饭
（3）当start后面的非谓语动词指心理状态或精神活动（即表示想法、
意见等的词,如think,realize,wonder,understand等）时.
如：She started to wonder who had done it.
她开始想是谁做了这件事.
注意:口语中大多时候都习惯用-to do的

快.选ABC的He started _____the piano when he was 5 years old.A . He started to learn the piano when he was five years old. He started to learn the piano when he was five years old(改为同 The boy started playing the piano when he was four years old he started swim when he was four years old He started _____to ride a bicycle when he was 3 years old.At tom started learning music when he was eight years old. Moart started writing music when he was four years old Mozart started writing music when he was four years old . Mozart started writing music when he was four years old. he started swimming when he was four years old 等于 he started he could play the piano well when he was seven years old的同义句