题目内容
15.When you are home,give me a call to let me know you __________ safely.( )| A. | arrived | B. | have arrived | C. | will arrive | D. | are arriving |
分析 当你到家了,给我打个电话告诉我你已经安全到达.
解答 答案:B.know后加宾语从句,主句是一般现在时,从句时态不受限制,结合前后文可知动作发生在过去,对现在造成一定的影响,故用现在完成时have/has+过去分词,主语you,故have,故答案是B.
点评 现在完成时有两种用法1.过去发生的某一动作对现在造成的影响或结果或到现在为止已经发生或完成的动作.2.表示过去发生的、持续到现在的动作或状态.
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