单选题 There are those who consider it questionable that these (defenee-linked) research projects will (account for) an improvement in the standard of living or, alternately, (to do much) to protect our (diminishing) resources.

A、 defenee-linked
B、 account for
C、 to do much
D、 diminishing

【正确答案】 C

【答案解析】to do much改为(will)如much；连词or连接两个并列谓语，willaccountfor和(will) do much。C．to do much是不定式，不能与前面的谓语并列。