3道高二英语选择题、求讲解

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3道高二英语选择题、求讲解
1.In 1922,Howard Carter made his most amazing discovery --all his years of training as an explorer finally____!
A.came true
B.took off
C.paid off
D.showed up
2.__________,I knew he was not from Britain.
A.The moment he began to speak
B.Until he began to speak
C.Upon beginning to speak
D.Immediately he was spoken to
3.--Did Jack come back early last night?
--Yes.It was not yet eight o'clock _____he arrived home.
A.before
B.when
C.that
D.until

求详细解答、thanks

1.选C
come true 实现 take off 脱下,起飞 show up 出现
pay off 取得成功,有收获
根据句意：他多年作为探索者的训练终于有了回报.
2.A the moment 引导时间状语从句= as soos as 一...就...
翻译：他一开口,我就知道他不是北京的.
3.选C 强调句
it is / not until + 被强调部分+that
翻译：他回来时还不到八点

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