How can they learn anything _____ they spend all their spare time watching television?
A．forB．whenC．whileD．because
B
考查狀語(yǔ)從句連詞。When=since既然。句意：既然他們把所有的時(shí)間都用在了看電視上，他們又怎么能學(xué)到東西呢？
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