___you read this,thousands of pictrues will have been sent to us.1 before 2 when选择哪一个,及分别说出为什么对与错

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___you read this,thousands of pictrues will have been sent to us.1 before 2 when选择哪一个,及分别说出为什么对与错
___you read this,thousands of pictrues will have been sent to us.1 before 2 when
选择哪一个,及分别说出为什么对与错

___you read this,thousands of pictrues will have been sent to us.1 before 2 when选择哪一个,及分别说出为什么对与错
这两个都是正确的选项.它们都有by the time +句子的含义.
by the time+句子(一般现在时),将来完成时
(从句) (主句)