the scientist
The scientist __________ the experiment for half a year, but he _______ yet. A\uff0emade; didn\u2019t .D \u8003\u67e5\u65f6\u6001\u3002\u6839\u636efor half a year\u53ef\u77e5\u5e94\u8be5\u4f7f\u7528\u5b8c\u6210\u65f6\uff0c\u518d\u6839\u636e\u53e5\u610f\u53ef\u77e5\u5b8c\u6210\u8fdb\u884c\u65f6\u7b26\u5408\u53e5\u5b50\u7684\u610f\u601d\u3002Yet\u4e5f\u548c\u5b8c\u6210\u65f6\u8fde\u7528\u3002\u7ed3\u5408\u53e5\u610f\u53ef\u77e5D\u6b63\u786e\u3002\u53e5\u610f\uff1a\u534a\u5e74\u6765\u90a3\u4f4d\u79d1\u5b66\u5bb6\u4e00\u76f4\u5728\u505a\u90a3\u4e2a\u5b9e\u9a8c\uff0c\u4f46\u4ed6\u8fd8\u6ca1\u6709\u6210\u529f\u3002
half a year \u6b63\u786e,\u610f\u4e3a\u534a\u5e74.\u4e0e\u6b64\u7c7b\u4f3c\u7684\u642d\u914d\u4f8b\u5b50\u8fd8\u6709\u6211\u4eec\u6700\u5e38\u89c1\u7684half an hour(\u534a\u5c0f\u65f6)
\u7b2c\u4e8c\u4e2a\u95ee\u9898:one and half year\u4e3a\u6b63\u786e\u8868\u8fbe,\u4e00\u5e74\u534a
\u82f1\u8bed\u5206\u6570\u8868\u8fbe,\u4e2d\u95f4\u52a0\u4e0a\u8fde\u5b57\u7b26\u7684\u8bdd\u53ef\u5c06\u524d\u540e\u4e24\u8bcd\u8fde\u4e3a\u4e00\u4e2a\u72ec\u7acb\u7ed3\u6784,\u5728\u53e5\u5b50\u4e2d\u8d77\u5230\u5f62\u5bb9\u8bcd\u7684\u4f5c\u7528.\u4f8b\u5b50:he is a two-year-old boy.
为什么用hasn't succeeded 而不用 succeeded
succeeded是过去式,而现在说的是: 他至今还未成功. 这事发生在现在.
而且有完成时标志词"yet "
A:has been making;hasn't succeeded
那个科学家半年来一直在做那个实验,但他还没有成功.
现在还没成功,是完成时.
所以,前面的"半年来一直在做那个实验" 还将继续下去,是完成进行时.
A
现在完成进行时,表示一个动作从过去的一个时间开始持续到现在,并将继续进行下去。
此题,这位科学家半年来一直在做实验,但是他还没有成功。
扩展阅读:texas instruments ... hes tried his best ... schools to be only ... we with achievement ... what he said corret ... the scientist has made ... the scientist coldplay ... i have worries that ... the scientist are still ...