Bộ 20 đề luyện thi Chuyên Anh năm 2023 có đáp án (Đề 91)

Good pencils erasers are soft enough not to damage paper they crumble gradually when used.   A. but hard enough so that   B. and enough hard that      C. and they are so hard that   D. so ha

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Good pencils erasers are soft enough not to damage paper _____ they crumble gradually when used.

but hard enough so that

and enough hard that

and they are so hard that

so hard are they

Giải thích

Đáp án: A