David can speak idiomatic American English and yet, _____ English, he doesn't know it at all.
A．how to teachB．when it comes to teaching
C．when he teachesD．however he teaches
B
when it comes to doing sth.是慣用法，意思是“當提到……的時候，”符合題意，而其它選項在邏輯上與上下文不符。
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