---Was it the new school headmaster who walked by ?
--- _____.
A．It must be thatB．It must have beenC．He must beD．This must have been
B
考查問題回答，問句是it為主語，回答也是it為主語，而且是對過去情況的推測，選B，句意是：--剛剛走過的是校長嗎？--一定是。It must have been ="It" must have been the new school headmaster。
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