She's been working hard _____ her English skills. A. ...

[ Prepositions ]

She’s been working hard _____ her English skills.

A. about

B. at

C. on

D. with

Select your answer:

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Progressive Perfect and Simple Verb Tenses › View

Fill in the blank for FUTURE PERFECT tense:

“That company _____________ merged with the overseas competitor by next March.”

A. has

B. have

C. had

D. will have

Grammar › View

This is ______ software, and you have no right to copy it without a license from the owner.

A. propitious

B. propriety

C. propitiatory

D. proprietary