John's score on the test is the highest in the class ; （）he last night.
A、muststudyC
「句意」约翰的考试分数全班最高;他昨天晚上一定学习了。
「难点」表示对过去某一动作行为的猜测须要用musthavedone这一句型结构。
Priceshaverecentlyriseninorderto__________theincreasedcostofrawmaterials.
Evenifhisletter____tomorrow，it____toolatetodoanything.
Iwastohavemadeaspeechif_____.
Theopeningceremonyisagreatoccasion.Itisessential_____forthat.
It’shightimewe_____cuttingdowntherainforests.
