Let’s put off the picnic until next week, _____ the weather may be better.

       A. then                                              B. if

C. as                                                 D. when

Let’s put off the picnic until next week, _____ the weather may be better.
 A. then       B. if
C. as       D. when

Let’s put off the picnic until next week, _____ the weather may be better.

1. A.
   then
2. B.
   if
3. C.
   as
4. D.
   when

Let’s put off the picnic until next week ________ the weather may be better．

  A．since     B．if       C．as     D．when

Let’s put off the picnic until next week, ________ the weather may be better.

　　A．as

　　B．then

　　C．if

　　D．when

　　A．as

　　B．then

　　C．if

　　D．when