Extract:
Which of the following words or phrases fits best in the following sentence?
The radiology department sends Troy to pick up lunch ___________ it isn’t too busy at the office.
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A
as long as
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B
as if
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C
after
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D
unless
The phrase "as long as" fits best because it establishes a conditional permission relationship, Troy may pick up lunch provided the department isn't too busy.
A) as long as
"As long as" correctly introduces a conditional requirement or permission, "Troy may pick up lunch provided that (on the condition that) it isn't too busy." This creates logical cause-permission relationship matching the context.
B) as if
"As if" introduces hypothetical comparisons ("He acted as if he were sick"), semantically inappropriate for establishing actual conditions affecting permission to leave.
C) after
"After" establishes temporal sequence, not conditional permission. "After it isn't too busy" creates logical contradiction (busyness is a state, not an event with clear endpoint).
D) unless
"Unless" introduces exceptions to negative statements, "Troy won't pick up lunch unless it isn't busy" would create double negative confusion. "Unless" doesn't fit the positive permission structure here.
Conclusion
Conditional permission statements ("may do X as long as Y condition holds") require "as long as" to establish the prerequisite condition. Other conjunctions create temporal, hypothetical, or logical relationships incompatible with the intended meaning of conditional permission.