Our neighbor offered to look after our baby yesterday when we were busy, _____is often the case.

A．it B．that C．which D．as

D

解析試題分析：考查定語從句。這里考查由as引導的非限定性定語從句，as在句中由“正如”之意。句意：昨天當我們都很忙的時候，我們鄰居主動來照顧我們的嬰兒，通常就是這樣的。故D正確。
考點：考查定語從句

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