Trắc nghiệm Tiếng Anh Toeic - Part 5 Test (Đề 1)
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There will be a software upgrade tomorrow, ____ please back up any important files you have stored on the server A. rather B. while C. so D. because

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There will be a software upgrade tomorrow, ____ please back up any important files you have stored on the server 

rather

while

so

because

Giải thích

Chọn đáp án C