📝 Multiple Choice Question
General-english
The manager said to the clerk, 'Do you know how to operate this machine?'
A
The manager asked the clerk if he knew how to operate that machine.
B
The manager asked the clerk if he knows how to operate this machine.
C
The manager asked the clerk whether he knew how to operate this machine.
D
The manager asked the clerk that if he knew how to operate that machine.
Explanation
Interrogative uses 'if/whether'. 'This' becomes 'that', present becomes past.
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