the box is too heavy to carry后面要不要加it

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theboxistooheavytocarry后面要不要加ittheboxistooheavytocarry后面要不要加ittheboxistooheavytocarry后面要不要加it不要,因为主语

the box is too heavy to carry后面要不要加it
the box is too heavy to carry后面要不要加it

the box is too heavy to carry后面要不要加it
不要,因为主语是the box