No sooner______ themselves in their seats in the hall than the speaker began his speech.
A．they settledB．had they settled
C．did they settleD．they had settled
B

試題分析：句意：他們一在座位上坐下，演講者就開始他的演講。no sooner…than…,hardly…when…結構中，主句應用過去完成時的倒裝結構。故選B。
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