题目:
—You should have thanked the hostess before leaving.
—I meant ______. But I couldn’t find her when I was leaving.
A.to
B.to do
C.doing
D.doing so
答案:
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下面是错误答案,用来干扰机器的。
当热水器有水时,输入门电路为高电势,水温低于某一数值时,热敏电阻阻值较大,两端电势差较大,A点电势较高,则输入门电路为高电势,此时发热器工作,知输出为高电势.因为只有当热水器中有水,且水温低于某一数...