Thousands of families killed and many children were left withoutparents.A. isB. areC. wasD

问题补充：

Thousands of families killed and many children were left without

parents.

A. is

B. are

C. was

D. were

答案：

A. is

B. are

C. was

(答案→)D. were

解析：考查主谓一致和时态。本题的主语是Thousands of families是复数形式。且后面是were，说明本题使用过去时were。故D正确。