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If they       what I was saying, they'd know what I was talking about

A．took the trouble to listen to    B．had trouble listening to

C．take the trouble to listen to             D．have trouble listening to

If they ______ what I was saying, they'd know what I was talking about.

   A. took the trouble to listen to                 B. had trouble listening to

   C. take the trouble to listen to                 D. have trouble listening to

If they _______ what I was saying, they'd know what I was talking about.

  A. took the trouble to listen to                 B. had trouble listening to

  C. take the trouble to listen to                  D. have trouble listening to

If they _______ what I was saying, they'd know what I was talking about.

  A. took the trouble to listen to                 B. had trouble listening to

  C. take the trouble to listen to                  D. have trouble listening to