.Before becoming president in 1928,Herbert Hoover () as Secretary of Commerce.a.has served b.was served c.had served d.serving\

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.Beforebecomingpresidentin1928,HerbertHoover()asSecretaryofCommerce.a.hasservedb.wasservedc.hadserve

.Before becoming president in 1928,Herbert Hoover () as Secretary of Commerce.a.has served b.was served c.had served d.serving\
.Before becoming president in 1928,Herbert Hoover () as Secretary of Commerce.
a.has served b.was served c.had served d.serving\

.Before becoming president in 1928,Herbert Hoover () as Secretary of Commerce.a.has served b.was served c.had served d.serving\
c. had served
serve 供职
赫伯特·胡佛于1928年成为总统之前,是商务部长.

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