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We     writing a letter of complaint to the manager himself．But we'd like to hear your opinion first．

A．have been thinking of                          B．had thought of

       C．were thinking of                      D．thought of

We     writing a letter of complaint to the manager himself．But we'd like to hear your opinion first．

       A．have been thinking of             B．had thought of

       C．were thinking of               D．thought of

We     writing a letter of complaint to the manager himself．But we'd like to hear your opinion first．

A．have been thinking of                            B．had thought of

C．were thinking of                             D．thought of