it will not be long_____they come back(填介词)

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it will not be long_____they come back(填介词)
it will not be long_____they come back(填介词)

it will not be long_____they come back(填介词)
it will not be long__before__they come back他回来不久

when

until(not...until...)

till

until

填before.
意思是:他不久就会回来。