Advanced English Primary 4 Grammar

The scientists _______ on the experiment for six months before they finally _______ a breakthrough last Tuesday.

A had been working / made
B have been working / made
C were working / have made
D had worked / were making
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Worked Solution

Step 1: Six months of ongoing effort before a past event — past perfect continuous (had been working) emphasises the extended duration leading up to the breakthrough. Step 2: Last Tuesday signals the breakthrough was a completed single past event — simple past made. Answer: had been working / made

Correct answer: had been working / made

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