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第1题

Mary has been a secretary in this company ______she graduated from Beijing University. 选择一项： A. since B. when C.
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第2题

Nowadays office work can be done by hand ______ very fast speed. 选择一项： A. at B. on C. in
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第3题

— I.ve got the system running, but I can.t open my file. — 选择一项： A. It.s my pleasure. B. Le
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第4题

— — I.ve called the maintenance worker. 选择一项： A. This copier needs repairing. B. I don.t li
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