Goldfish don’t know _______ to them three seconds ago.
A．what happens B．what is happeningC．what happenD．what happened
D

試題分析：英語賓語從句中一般為陳述語序。句意：金魚們不知道三秒前他們發(fā)生了什么事. happen to主語是事物,后接表示人的單詞做賓語,一般用sth happen to sb結(jié)構(gòu),某人發(fā)生了某事. 故選D.
點評：賓語從句中一般為陳述語序，需注意當疑問詞做從句主語時，則貌似倒裝句，需注意區(qū)分。關(guān)于引導詞的區(qū)分需結(jié)合引導詞的基本含義及其在句子中所承擔的句子成分進行具體分析。賓語從句的時態(tài)和主句沒有必然的聯(lián)系，需結(jié)合語境具體分析。
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