. (2010·江西名校模擬) —I’ve heard they went skiing in the mountains last winter.                           
—It ______ true because there was so little snow there then. 
A．may not beB．won’t beC．couldn’t beD．mustn’t be
C
詞義辨析。may not be可能不是；won’t be不會(huì)是；couldn’t be不可能是；mustn’t be不應(yīng)該是。句意：我聽(tīng)說(shuō)去年冬天他們?nèi)ド缴匣┝�。不可能是真的因�(yàn)槟鞘菚r(shí)那里幾乎沒(méi)有雪。所以選C。
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