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No sooner _____ themselves in their seats in the theatre _______ the curtain went up.

       A．they have settled; before  B．had they settled; than

       C．have they settled; when   D．they had settled;than

 No sooner _____ themselves in their seats in the theatre _______ the curtain went up.

         A．they have settled; before B．had they settled; than

         C．have they settled; when D．they had settled;than

 No sooner _____ themselves in their seats in the theatre _______ the curtain went up.

       A．they have settled; before                       B．had they settled; than

       C．have they settled; when                        D．they had settled;than

No sooner ________ themselves in their seats in the theatre _______ the curtain went up.

       A．they have settled; before  B．had they settled; than

       C．have they settled; when   D．they had settled; than

No sooner _________ themselves in their seats in the theatre _______ the curtain went up.

　 A．they have settled; before　 B．had they settled; than

　 C．have they settled; when 　　 D．they had settled; than