----You look pale and upset.
----Yes, my girl friend _____ an online chat with me non-stop until six o’clock this morning.
A．have been havingB．had hadC．was havingD．a(chǎn)m having
C
until six o’clock this morning是一個過去的時間狀語, 故用過去進行時表示過去持續(xù)的動作。注意A項的干擾作用。
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