Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer in each of the following questions.
Having traveled to different parts of our country, ______.
A.we have learned a lot about interesting lifestyles and customs
B.we are seeing a lot of interesting lifestyles and customs
C.many interesting lifestyles and customs have been learned by us
D.much has been learned about interesting lifestyles and customs

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