There are no easy solutions to the problem, _____ solutions ...

★ Verb-ing or to Verb

There are no easy solutions to the problem, _____ solutions that are agreeable to all parties.

A. to begin with

B. not to mention

C. strange to say

D. to sum up

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I felt so cold that I could not help _____ when I talked to him.

A. shake

B. being shaken

C. to shake

D. shaking