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    16、Would you please turn up the lamp a little lighter? I ______the cells through the microscope．

    A．was observing                    B．have observed

    C．am observing                     D．have been observed

    16、C

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    Would you please turn up the lamp a little lighter? I ______the cells through the microscope．

    A．was observing                    B．have observed

    C．am observing                     D．have been observed

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