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All documents, letters and emails interchanged between two parties () the signing of the Contract shall become () automatically from the date on which the Contract comes into force.

All documents, letters and emails interchanged between two parties () the signing of the Contract shall become () automatically from the date on which the Contract comes into force.
A.when, null and void
B.before, null and void
C.before, void and null
D.on or before, void and null
正确答案:A