Bộ 3 Đề kiểm tra Unit 4 - Tiếng anh 10 iLearn Smart World có đáp án (Đề 1)

Some of my friends ______________ volunteer work for many years, but I only ______________ last summer.

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Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Some of my friends ______________ volunteer work for many years, but I only ______________ last summer.

are doing/ have started

have done/ started

have done/ have started

did/ started

Giải thích

Chọn B