单项选择题

We investigated other companies in the market to discover ______ they handled complaints from their customers.

A．that
B．how
C．what
D．where
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If you are not able to attend your appointment with your doctor, or need to change it to a more convenient time, it is important that you let us know as soon as possible. This will enable us to offer your appointment to another patient and rebook you another, more convenient time. To cancel or change your appointment, please use one of the following two methods: * Telephone at 0161 206 4100 (between 8:30am -8:00pro Monday -Friday). * Via the Online Form at www.srht.nls.uk changeappointment.
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How can Cashplus be used？ Through （）.
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