Mr. Green didn’t understand ________ made his daughter so absent-minded this morning.
A．how that wasB．what was it
C．why it was thatD．what it was that
D
考查強(qiáng)調(diào)句的疑問形式。根據(jù)題意可知，賓語從句中缺少主語，故用what引導(dǎo)其強(qiáng)調(diào)句，選D。
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