We 1000 English words since we to learn English. A．learned; begin B．have learning; began C．have learn; begun D．have been learning; began 题目和参考答案——青夏教育精英家教网—

We __________ 1000 English words since we __________ to learn English.

A．learned; begin	B．have learning; began
C．have learn; begun	D．have been learning; began

【答案】

【解析】since 引导的时间状语从句中，当从句中用since+表示一般过去时时，主句要用现在完成进行时或现在完成进行时，（动词必须是延续性动词）故选D

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