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Only after he has acquired considerable facility in speaking______to learn to read and write.
A．he began
B．will he begin
C．did he begin
D．must he begin

A.
A．he
B.will
C.did
D.must

【参考答案】

B
本题考查倒装结构，only放在句首要求句子倒装，由于从句中动词为现在完成时，所以主句用一般将来时。题意为，只......

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