You should understand the math problem now, you have had it ______ three times.

A. explaining
B. to explain
C. explained
D. explain
C
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科目：初中英語 來源：期中題 題型：單選題

You should understand the math problem now, you have had it ______ three times.
[     ]
A. explaining
B. to explain
C. explained
D. explain

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