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I ________ to call the customer service of my bank all morning, but I can't get through.

A. had been trying
B. would be trying
C. tried
D. have been trying
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DUUnit-Bইংরেজি - গ্রামার ও ভোকাবুলারিTense and Sequence of TenseTense and Sequence of Tense (Topic Practice)DU - ⚡ অনলাইন প্রশ্নব্যাংক দেখুন 💥
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সঠিক উত্তরঃ D. have been trying
Explanation: