说出为什么括号里填这个.1.people should always (be friendly) to each other2.we (have)already (visited)whe botanical.3.we should (reuse) the plastic bags.

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说出为什么括号里填这个.1.peopleshouldalways(befriendly)toeachother2.we(have)already(visited)whebotanical.3.wesh

说出为什么括号里填这个.1.people should always (be friendly) to each other2.we (have)already (visited)whe botanical.3.we should (reuse) the plastic bags.
说出为什么括号里填这个.
1.people should always (be friendly) to each other
2.we (have)already (visited)whe botanical.
3.we should (reuse) the plastic bags.

说出为什么括号里填这个.1.people should always (be friendly) to each other2.we (have)already (visited)whe botanical.3.we should (reuse) the plastic bags.
friendly为形容词,要与be动词连用,should为情态动词,后面动词用原形.
由already看出此句话为现在完成时,have+过去分词.
这句话是根据句子本身意思,要再次使用塑料袋,不要用一次就直接扔掉.