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高中英语单选1.When all his money____,Tom had no choice but to turn

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高中英语单选
1.When all his money____,Tom had no choice but to turn to a friend for help
A had run out Bhas run out
为什么选A
2.Tom,another mistake!
Oh,I never____I would make any mistakes this time
Athought B have thought
为什么选A?
3.The old soldiers,____left their homeland about 40 years ago ,felt very happy when returning.
A some of them B some of whom
选B 这道题句子成分不太明白
4.I was surprised by her words,which made me recognize ___silly mistakes I had made.
Awhat B how
句子成分不明白 how 作状语吗?
谢谢
1.过去完成时表示此动作发生在另一过去动作(即:had no choice)之前.
2.说的是过去的想法,与现在无关,因为现在已经知道犯错了.
3.some of whom left their homeland about 40 years ago 为定语从句,whom为定语从句的引导词.The old soldiers felt very happy when returning.为主句.
4.此题要选A .what silly mistakes I had made 为感叹句,其句式构成为:what + (a) +adj.+n.+主语+谓语!