前面是it's用什么?it was 用什么?
人气:113 ℃ 时间:2019-09-09 11:44:57
解答
it's后面可跟一般现在时的被动式,也可跟一般过去时的被动式(需根据具体的语言环境判断);
it was后面只能跟一般过去时的被动式.
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