I always get nervous when I see the envelope _____ school _____ the mail.
问题描述:
I always get nervous when I see the envelope _____ school _____ the mail.
答
I always get(got) nervous when I see(saw) the envelope __from___ school __in___ the mail
当我看到邮箱里学校寄来的信封时总是感到紧张