50 years ago,There ( )no subwaya,was b,were

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50yearsago,There()nosubwaya,wasb,were50yearsago,There()nosubwaya,wasb,were50yearsago,There()nosubway

50 years ago,There ( )no subwaya,was b,were
50 years ago,There ( )no subway
a,was
b,were

50 years ago,There ( )no subwaya,was b,were
A

A嘛
很明显的单数形式~~

a.was.
subway是单数,故选was

was ,只是描述50年的状况,是统统的一种情况,用单数。