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
B
no sooner…than…,hardly…when…结构中，主句应用过去完成时的倒装结构。故选B。