He met many problems------ he was going over his lessons.A．beforeB．as soon asC．s
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He met many problems------ he was going over his lessons.| A．before | B．as soon as | C．since | D．while |
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答案
| D |
解析
| 考查连词。此句中主句中是一般过去时，而从句中是过去进行时，故用while。 |
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