800 câu trắc nghiệm Điền từ Tiếng Anh có đáp án - Phần 1

In a windowing environment in which more than one program or document can be available to the user, open but currently inactive (2) _______ are said to be in the background.

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In a windowing environment in which more than one program or document can be available to the user, open but currently inactive (2) _______ are said to be in the background. (2) ....................

windows

systems

tasks

characters

Giải thích

A là đáp án đúng