问题
选择题
How can they learn anything _____ they spend all their spare time watching television?
A．for
B．when
C．while
D．because
答案
答案：B
考查状语从句连词。When=since既然。句意：既然他们把所有的时间都用在了看电视上，他们又怎么能学到东西呢？
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