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题库 / OG2017V-SC-226
Around 1900, fishermen in the Chesapeake Bay area landed more than seventeen million pounds of shad in a single year, but by 1920, overfishing and the proliferation of milldams and culverts that have blocked shad migrations up their spawning streams had reduced landings to less than four million pounds.
that have blocked shad migrations up their spawning streams had reduced landings to less
that blocked shad from migrating up their spawning streams had reduced landings to less
that blocked shad from migrating up their spawning streams reduced landings to a lower amount
having blocked shad from migrating up their spawning streams reduced landings to less
having blocked shad migrations up their spawning streams had reduced landings to an amount lower
specifically, you don't use "fewer than" with NUMBERS + UNITS OF CONTINUOUS MEASURE, such as gallons, years, feet, liters, etc.
this isn't really an exception to the rule, anyway, since those units fail both of the criteria above. for instance, if i have N gallons of something, then (1) fails because i can easily have a decimal number of gallons, and (2) of fails because the gallons are not physically separable quantities -- just one big mass of fluid.
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