填空题

When I found her she (concentrate) ______ on her work.

【参考答案】

was concentrating
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Here is the letter from a foreign company (concern) ______ the order of our new products.
单项选择题
A．In a bank.B．In a restaurant.C．In a store.D．At a school.
A．In a bank.
B．In a restaurant.
C．In a store.
D．At a school.
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