Every means ________, but we find that only by this means can we do it well.
A.
has been trying
B.
had tried
C.
has been tried
D.
have been tried
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参考答案:
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【单选题】听力原文:W: Hi, Frank. What are you up to? Is that really a French grammar book? M: Well, I'm trying to teach myself some French. When I go to Montreal next semester, I don't want to sound like just anoth...