Where's your letter I____ it into the mailbox just now Adrop Bdroped Cdropped A还是C?Give me reason

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Where's your letter I____ it into the mailbox just now Adrop Bdroped Cdropped A还是C?Give me reason
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Where's your letter I____ it into the mailbox just now Adrop Bdroped Cdropped A还是C?Give me reason
Where's your letter I____ it into the mailbox just now Adrop Bdroped Cdropped A还是C?
Give me reason

Where's your letter I____ it into the mailbox just now Adrop Bdroped Cdropped A还是C?Give me reason
C,dropped
just now ------------是过去时

C
just now 刚才(过去的时间)

C. drop是重读闭音节末尾一个辅音字母的单词,变过去式时,先双写末尾辅音字母,再加ed
这是一个定语从句,I后在的句子做letter的定语。