The correct answer is D: unless he sends me the bill again. The sentence requires a conditional clause meaning 'if not' or 'except when'. 'Unless' means 'if not' and is the appropriate conjunction here: the speaker will pay only on the condition that the bill is sent again.
A.till he sends me the bill again
B.until he sends me the bill again
C.if he sends me the bill again
D.unless he sends me the bill again✓ Correct
Explanation
The sentence requires a conditional clause meaning 'if not' or 'except when'. 'Unless' means 'if not' and is the appropriate conjunction here: the speaker will pay only on the condition that the bill is sent again. 'Till' and 'until' indicate time, suggesting the action will happen after the bill is sent (which is logically possible but slightly awkward with 'not pay'). 'If' would require 'doesn't' to convey the conditional negative meaning. 'Unless' captures the intended meaning most precisely.
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