[ Grammar ]
_______ withstands testing, we may not conclude that it is true, but we may retain it.
A. If a hypothesis
B. That a hypothesis
C. A hypothesis
D. Hypothesis
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Present Perfect Simple vs Continuous › ViewWe __________ (talk) about this for too long.
A. have talked
B. have been talking
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You ……………. pay attention to the road when you drive
A. must
B. mustn’t