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题库 / OG2021-SC-869
In the United States, less than half as many multifamily housing units were produced in the 1990s than in each of the previous two decades.
less than half as many multifamily housing units were produced in the 1990s than
less than half as many multifamily housing units had been produced in the 1990s as
there were less than half as many multifamily housing units produced in the 1990s than
fewer than half as many multifamily housing units were produced in the 1990s as
fewer than half as many multifamily housing units had been produced in the 1990s than
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