请说明理由1,these trees must have been planted three years ago.___?a.weren't they?b.must'nt theyc.didn't theyd.haven't they2.an iron and steel works ,with some satelite factories,__to be built herea.are goingb.is goingc.shalld.will3.the boy and
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![请说明理由1,these trees must have been planted three years ago.___?a.weren't they?b.must'nt theyc.didn't theyd.haven't they2.an iron and steel works ,with some satelite factories,__to be built herea.are goingb.is goingc.shalld.will3.the boy and](/uploads/image/z/1172840-32-0.jpg?t=%E8%AF%B7%E8%AF%B4%E6%98%8E%E7%90%86%E7%94%B11%2Cthese+trees+must+have+been+planted+three+years+ago.___%3Fa.weren%27t+they%3Fb.must%27nt+theyc.didn%27t+theyd.haven%27t+they2.an+iron+and+steel+works+%2Cwith+some+satelite+factories%2C__to+be+built+herea.are+goingb.is+goingc.shalld.will3.the+boy+and)
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