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單項(xiàng)選擇題

We have made ____ clear that the goods should be packed in cartons.

A. it
B. them
C. this
D. which

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We shall advise you ____ we are able to supply the goods again.

A. as
B. while
C. as soon as
D. until

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We are in receipt of your letter dated Jan 8, ____ we are pleased to learn that you want to order 100 tons of the subject goods.

A. in which
B. from which
C. to which
D. at which