By the time a child is five, he _______ hundreds of hours of television.
A．will watchB．will have watchedC．had watchedD．is watching
B
在時間狀語從句中By the time+ 一般現(xiàn)在時態(tài)，表示的是將來，主句應(yīng)用將來完成時態(tài)，句意：到一個孩子五歲的時候，他將會已經(jīng)看了幾百個小時的電視了。所以選B。
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