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  I could have helped him out, to tell the truth, I _____ too busy.
A．amB．wasC．have beenD．had been
B
考查時態(tài)。句意：我本來能夠幫助他，說實話，我太忙了。結合語境可知下文描述的是過去的狀態(tài)，故用一般過去時態(tài)，選B。
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