The biologist a lot of difficulties while she stayed in Africa studying wild animals for 20 years.（　　）

A．may go through

B．might go through

C．ought to have gone through

D．must have gone through

【考點(diǎn)】must用法．

【答案】D

【解答】

【點(diǎn)評】

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發(fā)布：2024/4/20 14:35:0組卷：82引用：1難度：0.7

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1．Whale breathe through lungs just as we humans do， so they_______come up for air．（ ?。?/h2>