1、（ ）he was at home,Iwould have phoned him then A.Had I known B.I had konwn C.Would I known D.I would know2、we have been doing a lot of gardening( )A.late B.latest C.latter D.lately3、竖直上抛一质量为m的小球,经t秒小
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1.A 这是一个倒装而且也是个省略句.补充完整是：If I had known.省略If 则倒装为A.这是一个与过去试试相反的虚拟语气.从句用过去完成时had done 的形式,主句用would have done
2.选D表示最近,近来,A是迟到的意思.B是最新的,最近的C是late 的比较级更晚的.更迟的
3.A.======以下答案可供参考======
供参考答案1:
第三问选A供参考答案2:
ADA供参考答案3:
1.C2.B3.C