而根据第二句“have a meaningful effect in slowing climate change” 故排除B: will accelerate global environmental change。文章最后一句“what Washington does—or doesn’t do—to promote alternative energy may mean less at a time of a global shift in ...
must 肯定、may 可能 大、might 小、may not 可能不 might not can't 不可能、couldn't + do(be) 现在或将来 have done 过去 (二)三级试题汇编 1、The house is dark; the Browns ___ to bed. A. may go B. should go C. should have gone D. must have gone 2、—Tha...
(之前我们做过can have done用法小结,can have done表推测时都是对过去进行推测,但是may have done不仅可以推测过去) may/might have done 推测现在 “may/might+动词的完成式”表示对...
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