Advanced English Primary 4 Synthesis

Choose the most precise combination of these two sentences: "The school installed new safety equipment. Accidents have decreased significantly since then."

A Since the school installed new safety equipment, accidents have decreased significantly.
B Although the school installed new safety equipment, accidents have decreased significantly.
C The school installed new safety equipment, so accidents have decreased significantly.
D Unless the school installed new safety equipment, accidents have decreased significantly.
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Worked Solution

Step 1: The school installed equipment (past event) and accidents have decreased since (ongoing effect since the past event). Step 2: Since (meaning from the time that) + past event captures this ongoing relationship more precisely than so. Answer: Since the school installed new safety equipment, accidents have decreased significantly.

Correct answer: Since the school installed new safety equipment, accidents have decreased significantly.

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