正确答案: A

Once

题目：____________

解析：A

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学习资料的答案和解析：

[单选题]What does the phrase “clam up” in Paragraph 2 probably mean?

refuse to talkD． seek help

[单选题]when did the accident happen ?

at about 9:00am

[单选题]37______

explore

[单选题]蕨类植物的孢子体和配子体都能进行光合作用，能独立生活。( )

错误