填空题

【参考答案】

which→what。
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单项选择题
What does this conversation most probably take place
A．In a travel agency.
B．On a campus.
C．In a bookshop.
D．In a teachers’shop.
单项选择题
Why did NASA decide to bring the shuttle home earlier
A．The laboratory was closed.
B．The generator was turned off.
C．The power generator might explode.
D．Electricity was going to run out.
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