While the children … (play) in the yard, their mother … (call) them.
A. have played; called
B. played; was calling
C. were playing; called
D. were playing; was calling
Select your answer:
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Grammar › ViewA remarkably capable organ, an orchestration of physiological responses often happens in the human brain without an individual’s knowledge.
A. NO CHANGE
B. the human brain often orchestrates physiological responses without any conscious effort on the part of an individual.
C. physiological responses are often orchestrated by the human brain without any conscious effort on the part of an individual.
D. individuals are often unaware of the physiological responses the human brain orchestrates.
Modals and Vocabulary › View
Which of the following shows a strong obligation?
A. You can study for the exam.
B. You don’t have to study for the exam.
C. You must study for the exam.
D. You may study for the exam.