1.It was two days ago ______ Mr Green came to our school.

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1.It was two days ago ______ Mr Green came to our school.
A.if B.since C.when D.that
请说一下原因
2.We can save water ______ not brushing our teeth under a running tap.
A.in B.with C.use D.by
请说一下原因

D 这句话是强调句
a,如果.B,自从,多用于完成时态,这里是一般时态.C,当...时候.D,It is （被强调部分）that...
By是指通过怎样的方法,手段
如,搭公共汽车上学,是,go to school by bus

mr green came to china over two years ago mr green ( )to chi It _____ a year since Mr Stone ____ to our school A.was,came Mr Green left Shanghai two days ago （用since two days ago改写 Mr Green left Shanghai two days ago =Mr Green _ _ _ _Shangha It was great to receive a letter from you two days ago同义句 Mr Green arrived in shanghai two days ago.（改为同义句） ___two day It was 3 years ago ______ he came back. It was three months since he came to our school改错 Mr.white left our school two years ago句意不变 Mr.White has ___ 同义句改写 Mr Green came to China over ten years ago Mr Green came to China over ten years ago同义句 Mr Green came to China several years ago.(改为同意句）谢谢啊.