選accomplish.
本句句首的It作形式主語(yǔ),真正的主語(yǔ)是that引導(dǎo)的從句,即:that an efficient worker ... on time.that引導(dǎo)的主語(yǔ)從句采用了虛擬語(yǔ)氣,其完整的形式為It is necessary that an efficient worker (should) accomplish his work on time.
本句省略了主句從句中的should,因此accomplish為正確答案.
PLUS: 虛擬語(yǔ)氣與不定式
1.It is necessary + that ... 的結(jié)構(gòu)中,that引導(dǎo)的主語(yǔ)從句的謂語(yǔ)動(dòng)詞要用虛擬語(yǔ)氣,即 should + 動(dòng)詞原形,其中的should 可省略.
e.g. It is necessary that we (should) finish the task tomorrow.
2. 在不定式作形容詞的主語(yǔ)的句式中,It is necessary + 不定式
e.g. It is necessary for you to lock the car when you do not use it.