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bee a new . changed changed changed changed ( B )6.—Lisa,why are you still here?School is over. —I my classroom need fifteen more minutes. ’t clean ’t cleaned ’t clean ’t clean ( C ) think that there life on the earth for hundreds of millions of years. been been ( C )8.— you your lunch? —Yes,I had it ten minutes ago. 。 現(xiàn)在完成時(shí)側(cè)重于過(guò)去的動(dòng)作對(duì)現(xiàn)在造成的影響 。 I haven’t he