题目内容：
Interlanguage refers to a system of rules developed in the minds of L2 learners, which has some features of ______ plus some that are independent of ______.
A.the L1, the L1
B.the L2, the L2
C.the L1 and L2, the L1
D.the L1 and L2, the L1 and L2
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答案解析：