. — 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 |
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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 |
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