Whenever he makes a promise, he will ________ it.A.keep outB.insist onC.stick toD.stick at
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C解析stick to作“坚持”解,多用于表示坚持计划、决定、原则、诺言等,有执意不改变的意思。其中to是介词;insist on也有“坚持”的意思,但多用于表示坚持意见、要求、主张等。如:he insisted on my going there.另外,insist后接宾语从句时,从句谓语动词要用虚拟语气,表示“坚持要、坚持要求等。如:He insisted that the work (should) be finished before dark.但当“坚持说,坚持认为”时,从句用陈述语气。如:He insisted that he had done quite right.