Which of the following sentences is correct?

1. Which of the following sentences is correct?

[প্রাথমিক সহকারী শিক্ষক নিয়োগ ২০১৮ : 2018]

1. That shirt which he has bought is blue in colour

2. The shirt that which he bought is blue in colour

3. Which shirt he bought is blue in colour

4. The shirt which he bought is blue in colour

Answer

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"Education-Instruction-Inspiration"