单选题 (Neither) the engineer (nor) his assistants (was able to) solve the problem that had caused (a) great loss to the factory.

A、 Neither
B、 nor
C、 was able to
D、 a

【正确答案】 C

【答案解析】[解析] 应改为were able to。本题考查主谓一致的语法知识。并列连接词neither...nor，either...or，not only...but also在连接并列主语时，其后的谓语动词的数通常根据最后的主语的数来决定。本句的后一个主语为复数名词assistants，故选项C中的was应改成were才能保持主谓一致。