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گرامر کلمه ی ربط

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The chemical facts ……… as a by-product of their search for gold became the basis 
for modern chemistry.

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that had been accumulated by alchemists

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where accumulated by alchemists

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alchemists accumulating them

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had been accumulated by alchemists

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طلایی
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نقره‌ای
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برنزی
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پاسخ کاربر: گزینه‌ی اول
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