题目内容
The twin sisters have learned a lot ________ they came to China.
| A．when | B．after |
| C．since | D．as soon as |
C
解析试题分析：句意为：这对孪生姐妹到中国以来学了很多东西。when：当……时候，after：在……之后， since：自从……以来， as soon as：一……就……。根据语境，本句指的是过去某一动作对现在造成的影响或结果。“since+一般过去时句子”表示从过去某段时间以来，故选C。
考点：考查连词的用法。
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