I’m too busy_______(write）to my parents often

I’m too busy_______(write）to my parents often
I’m too busy_______(write）to my parents often

I’m too busy_______(write）to my parents often
I’m too busy to write to my parents often
too .to ...
是一个固定用法,意思是:太.以至于不能.
我太忙了以至于不能经常给我父母写信

too ....to ...
是一个固定用法，意思是:太....以至于不能......
这句话主要考试前半部分i m too busy to write .....
write后面的这个to是个介词，是用来混淆你的。难大概就难在这里：句子后面还有一个to.

to write 我太忙了以至于不能经常给我父母写信
望采纳！