During our trip to the Great Wall last week，I couldn't stop thinking that building it ________ have been a huge project in ancient times.（　　）

A． should

B． must

C． could

D． need

【考點】must用法．

【答案】B

【解答】

【點評】

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發(fā)布：2024/12/10 3:0:1組卷：115難度：0.7

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1．Whale breathe through lungs just as we humans do， so they_______come up for air．（ ）