21.執行以下Python程式片段，其結果為何？[商技111]
(A) 7
(B) 9
(C) 11
(D) 12
dp = [0 for _ in range(10)]
dp[0], dp[1], dp[2] = 1, 2, 2
for i in range(3, 8):
dp[i] = dp[i - 2] + dp[i - 3]
print(dp[7])

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