He was riding to school it began to rain.A．asB．soC．whileD．when
题型：不详难度：来源：
| He was riding to school it began to rain. |
答案
| D |
解析
| 考察连词。as 作为，随着；so 因此；while当……时，强调动作同时发生。 When当……时。句意：当天开始下雨时，他正在骑车去学校。结合语境可知选D。 |
举一反三
| We won’t start the meeting our teacher arrives. |
| Finally, tired happy, we took the subway back home. |
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Bill won’t make any progress __ he studies harder than before.| A．if | B．when | C．because | D．unless |
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