B.) if
C.) as
D.) unless
[单选题][A] While [B] When [C] Though [D] Unless
[单选题]_________[A] if [B] unless [C] as [D] lest
[单选题][A] Although[B] Unless[C] As[D] If
[单选题]A.) AsB.) BecauseC.)ThoughD.)If
[单选题][A] meanwhile [B] unless [C] whereas [D] for
[单选题][A] Unless [B] As [C] Lest [D] Although
[单选题]A.) butB.) becauseC.) unlessD.) when
[单选题][A] but [B] whereas [C] though [D] while
[单选题]A. unlessB. sinceC. lestD. although
[单选题]A. beforeB. unlessC. untilD. because