题目内容

_______ working hard can we succeed in doing anything.

A. Only by
By
C. By only
D. Only

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_______ she took off her dark glasses did Irecognize she was a famous star.

A. Until
B. Until not
C. Not until
D. Till

______ a good boy is he that we all love him.

A. So
B. Very
C. Pretty
D. Such

----I'd met Smith several times before.----_________.

A. So did I
B. So had I
C. I did, either
D. I met also

Not only _____ a promise, but he also kept it.

A. did he make
B. he made
C. had he made
D. he had made