Which is a complex sentence?

a. the technician installed my hard drive and turned on my computer.

b. both computers are powerful, but this one is less expensive.

c. my computer is lightweight, powerful, and portable.

d. after you install the security software, your computer will run smoothly.

Aids is growing fastest in the poorest countries of africa. these nations don’t have enough doctors, medical labs, or money for medicine. a recent study showed that only a small percentage of hiv-infected children in africa are getting any medical treatment at all. what central idea is emphasized in both sources? the hiv/aids epidemic in africa is serious. the hiv/aids epidemic in south africa is serious. the hiv/aids epidemic among african children is serious. the hiv/aids epidemic among south african children is serious

Which verb or verb phrase signals an inappropriate shift in mood. a) will you let b) should first change c) must attend d) will be served

The room was gaudy with its leather couch and purple walls