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Several weeks had gone by____________I realized the painting was missing.

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

. Several weeks had gone by ________ I realized the painting was missing.

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

Several weeks had gone by _______I realized the painting was missing.

A. as                 B. before

C. since               D. when

Several weeks had gone by ________ I realized the painting was missing.

A. as

B. before

C. since

D. when

A. as

B. before

C. since

D. when

Several weeks had gone by_______I realized the painting was missing.

A. as　　　　　　 　　　　　　　　　　　　　　　　　　　　　　   B. before

C. since　　　　　　 　　　　　　　　　　　　　　　　　　　　   D. when

A. as　　　　　　 　　　　　　　　　　　　　　　　　　　　　　   B. before

C. since　　　　　　 　　　　　　　　　　　　　　　　　　　　   D. when

Several weeks had gone by____I realized the painting was missing. 

Several weeks had gone by____I realized the painting was missing. 

A．a(chǎn)s               B．before            C．since             D．when