[ Comma ]
Before cooking the chef always washes his hands.
A. Before cooking the chef always washes his hands.
B. Before, cooking the chef always washes his hands.
C. Before cooking, the chef always washes his hands.
D. Before cooking, the chef, always washes his hands.

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The two swans………. swam on the lake.
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Em hãy chọn đúng động từ “tobe” cho câu ước ở hiện tại?
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