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單項(xiàng)選擇題

We have received your letter of September 12，（）we are glad to know that you are interested in our electric heaters.

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

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We are（）to have your enquiry for Sewing Machines.

A.please
B.pleased
C.pleasure
D.in pleasure

單項(xiàng)選擇題

We have to point out that the postponement of the fulfilment of the contract（）caused us certain expenses.

A.had
B.have
C.has
D.having