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A form is said to be free if it may stand alone without changing its meaning; if not, it is a bound form, so called because ..............................

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A form is said to be free if it may stand alone without changing its meaning; if not, it is a bound form, so called because ..............................

It is always bound by something else.

It is always bound for something else.

It is always bound with something else.

It is always bound to something else.

Giải thích

Chọn đáp án D.