★ Tenses Quiz
Which tense is used to express that an action started in the past and is continuing till now?
A. present perfect
B. past perfect
C. past continuous
D. present perfect continuous
Select your answer:

Topics:
Upper Limb Muscle Tissues Urinary Respiratory Diseases Histology of the Ear Human Circulatory System Human Digestive System Metabolism DNA HCMA - Hematology Bacteria and Protist Review Mouth - Stomach Enzymes and Movement of Substances Integumentary System & Body Directions Central and Peripheral Nervous SystemOther quiz:
Immunology › ViewThe innate immune response against bacteria may be initiated by recognition of certain broad structures on microbial surface by Pathogen Recognition Receptors (PRRs). The broad structures are:
A. Oligosaccharides
B. PAMPS
C. Capsule
D. Lipids
Structures and Functions of Living Organisms and Genetics › View
Which characteristic does a child inherit from his parents?
A. hair style
B. color of eyes
C. favorite sport
D. ability to draw