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—Alice, you look puzzled. Have you understood it?

—Yes, I         another problem just now.

A. have thought of      B. am thinking of

C. had thought of       D. was thinking of

―Alice, you look puzzled. Have you understood it?

―Yes, I          another problem just now.

       A．have thought of    B．thought of           C．was thinking of    D．had thought of

—Alice, you look puzzled. Have you understood it?

—Yes, I          another problem just now.

A．have thought of           B．thought of           C．was thinking of             D．had thought of

 —Alice, you look puzzled. Have you understood it?

—Yes, I         another problem just now.

A. have thought of      B. am thinking of

C. had thought of       D. was thinking of