only to do还是only doing

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Bob checked the equipment thoroughly, only ______ the power was not set.

A. find

B. found

C. finding

D. to find

上题有两个动词checked和was，那么就有一个从句，引导词已经省略，引导词应该是？

what

which

that

this

—I am learning the piano. How can I learn it well?

—______ the traditional first before trying the modern.

A. Master

B. Mastering

C. Mastered

D. To master

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