Direction: The following item has part of the sentence followed by four alternatives. Complete the sentence by choosing the correct alternative.
He actually smiled,
1
though it was so brief that she questioned whether she had imagined it.
2
if it was so brief that she questioned whether she had imagined it.
3
unless it was so brief that she questioned whether she had imagined it.
4
until it was so brief that she questioned whether she had imagined it.