MODULE 17- Đại từ nhân xưng, Đại từ sở hữu và Đại từ phản thân
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The whole country was very upset ______ the President was assassinated. A. before B. until C. when D. as long as

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The whole country was very upset ______ the President was assassinated.

before

until

when

as long as

Giải thích

Chọn đáp án C