So far we () about 1000 trees. a.planted b.have planted c.have been planted d.to plant

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• 1根据句子含义填入正确的单词,单词的第一个字母已给出Where are you,Tom?I am d_____.Where have you been last night?I was staying at home a______ the time.2选择填空She ______ sick for five days.A.has B.has already C.has been D.is going toThe Whites _____.A.has already left B.is going to leaveC.have left D.have been leftIt _______ six weeks since he left the city.A.have been B.is going to be C.has been D.willSo far we ______ about 1000 trees.A.planted B.have planted C.have been plante
• So far we () about 1000 trees. a.planted b.have planted c.have been planted d.to plant
• So far we ( ) about 1000 trees. a.planted b.have planted c.have been planted d.to plant说明原因
• 急求,关于动量守恒定律!
• 有一个长50厘米、宽40厘米、高50厘米的水槽,水位高40厘米.现将一个长30厘米宽30厘米,高100厘米的