Choose one sentence that has the same meaning to the root one:
 “Minh has sent lots of emails to me since we were pen pals, ” said Thanh
A. Thanh told me that Minh has sent him lots of emails since we were pen pals.
B. Thanh told me that Minh had sent him lots of emails since they were pen pals.
C. Thanh told me that Minh had sent him lots of emails since they had been pen pals.
D. Thanh had told me that Minh had sent him lots of emails since they had been pen pals.

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