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Some people against toll booths ( 收费站) argue that roads, once___________, should be freE.
A.building B.built C.having built D.being built

A.B.building

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Tom owns _______largercollection of _______ books than any other student in our class. A.the; >不填 B.a; >不填 C.a; the D. >不填; the

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________ is often the case, wehave worked out the production plan. A.Which B.When C.WhatD.As

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