2. 外语
  3. If you are a successful language learner, you _____ independently, actively, and purposefully.

If you are a successful language learner, you _____ independently, actively, and purposefully.

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问题 If you are a successful language learner, you _____ independently, actively, and purposefully.
选项 A、had probably been learning
B、have probably been learning
C、were probably learning
D、have probably been learned
答案B
解析 have been doing是动词的现在完成进行时形式，表示从过去某时开始一直延续到现在的行为。根据句意，选项B正确。
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