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The play had already been on for quite some time when we _______ at the New Theatre.
A．have arrivedB．a(chǎn)rrived
C．had arrivedD．a(chǎn)rrive
B
主句的謂語動(dòng)詞用過去完成時(shí)，when從句的謂語動(dòng)詞要用一般過去時(shí)。而不能用過去完成時(shí)。
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