Mary once ______ with another musician to compose a piece of pop music. A: merged B: collaborated C: coincided D: constituted

Mr. Bristow suspects that Mr. Cross and Mr. Lawton ______. A: are brothers-in-law B: have collaborated in a under-the-table deal C: couldn’t have got away with it

Have you done any computer work? A: As a freelancer, I collaborated with my client to develop a web page. B: I have done a very good job in computer.