听力原文:What did the email from the director say? (A) I haven't had a chance to read it yet. (B) No, it was sent last week. (C) Yes, there was a file attached. (11)
A.
B.
C.
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【单选题】The oil pressure in the gas production curve drops significantly, the water production decreases, and the casing pressure does not change significantly. The possible reason is ( )
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