题目内容
12.China send people into space before,but now we can.( )| A. | can't | B. | couldn't | C. | may not |
分析 中国以前不能把人送入太空,但是现在我们能.
解答 答案:B.can't不能;couldn't不能(can't的过去式形式);may not不可以.根据before和but now we can可知以前不能,所以要用一般过去时,故选B.
点评 本题考查了情态动词的用法.解答时注意区分句意以及所给选项的意思.
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