Most parents encourage their children to take an active part in social events, ______ those events do not interfere with their studies.
A．concerningB．untilC．unlessD．provided
D
詞義辨析題。A. concerning 關(guān)于  B. until 直到 C. unless 除非   D. provided 只要 大多數(shù)父母允許孩子參加參加社會(huì)活動(dòng)只要這些活動(dòng)不影響學(xué)習(xí)。 根據(jù)語境選D
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