摘要： So far, I haven’t had any success. , I’ll keep trying.

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I haven’t had any success. , I’ll keep trying.

A.
So far; But
B.
Now; However
C.
So far; However
D.
Until now; But

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________ I haven’t had any success. ________, I’ll keep trying.

[　　]

A．So far; But

B．Now; However

C．So far; However

D．Until now; But

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