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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.是惯用法,意思是“当提到……的时候,”符合题意,而其它选项在逻辑上与上下文不符。
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