800 câu trắc nghiệm Điền từ Tiếng Anh có đáp án - Phần 9

They do not need to carry students’ papers around with them any more. This is because online (5)______ allow students to electronically upload their homework for their teachers to read and ma

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They do not need to carry students’ papers around with them any more. This is because online (5)______ allow students to electronically upload their homework for their teachers to read and mark. Of course, this also means that students can no longer use the excuse that the dog ate their homework!

materials

systems

structures

sources

Giải thích

B là đáp án đúng