PRACTICE TEST 5- Đại từ nhân xưng, Đại từ sở hữu và Đại từ phản thân
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The vaccine ______ in Switzerland in 1974. A. was developed B. has been developed C. is developed

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The vaccine ______ in Switzerland in 1974.

was developed

has been developed

is developed

had been developed

Giải thích

Chọn đáp án A