She_____ a baby sitter for three years when she decided to qualify as a nurse.
A. has been
B. is being
C. is
D. had been
CUUnit-BSet-2ইংরেজি - গ্রামার ও ভোকাবুলারিTense & Sequence of TenseCU - ⚡ অনলাইন প্রশ্নব্যাংক দেখুন 💥
সঠিক উত্তরঃ
D.
had been
Explanation:

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