By the time hefourteen years old, headvanced mathematics all by himself.

admin2020-11-14 30

问题 By the time he______fourteen years old, he______advanced mathematics all by himself.

选项 A、has been: learned
B、had been: had learned
C、was: learned
D、was: had learned

答案D

解析本题考查动词的时态。“by+过去时间”是过去完成时的时态标志，因此本句主句部分谓语动词用过去完成时，而从句部分谓语动词用一般过去时。D为正确选项。

转载请注明原文地址:https://kaotiyun.com/show/AR4K777K

大学英语三级A级

相关试题推荐

随机试题

最新回复(0)