learned advanced mathematics all by himself.
到爱因斯坦14岁时,他已经自学了高等数学。 C 句意:当我与奶奶在电话中交谈时,她的声音听起来很虚弱,但到我们挂断电话时,她的声音已经充满了活力。考查动词时态。据题干her voice had been full of life为过去的过去,因此我们挂断电话为过去的动作。by the time +一般过去时的从句,主句用过去完成时,表示“到……时候为止,已经……”。
When I talked with my grandma on the phone, she sounded weak, but by the time we ______ up, her voice had been full of life.
A. were hanging
B. had hung
C. hung
D. would hang * *
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