I was out town at the time, so I don’t know exactly how it ____________________.
A．has happenedB．happenedC．happensD．was happening
B
考查時態(tài)。句意：那時候我出城了，因此我確實不知道它是怎么發(fā)生的。可以從句描述的是我出城使發(fā)生的動作，故用過去時態(tài)。選B。
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