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Walking exercises ____ be boring at times, but on a clear sunny morning nothing could be better.
A.mayB.willC.mustD.should
A
考察情态动词用法。A也许;B将会;C必须,一定;D应该;结合句意可知A正确。句意:有时候不行也许会很乏味,但是在晴朗的阳光灿烂的早晨,没有什么比这更好的了。
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