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. — Excuse me, did you notice whether the No. 18 bus had gone by?

— Not ______ I began to stand here.

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

―Excuse me, did you notice whether the No. 18 bus had gone by?

―Not ______ I began to stand here.

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

 — Excuse me, did you notice whether the No. 18 bus had gone by?

— Not ______ I began to stand here.

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