将文献综述的功能与相应的句子匹配。
1）给出过去到现在的文学的一般全景
2）表明知识的差距
3）突出以前研究的局限性
4）审查后续和更近的文献
i. The main limitation / downside / disadvantage / pitfall / shortfall of X is …
ii. Few researchers have addressed the problem / issue / question of …
iii. There is a considerable / vast amount of literature on …
iv. A number / An increasing number of studies have found that …
A、1- i, 2 -iii, 3-iv, 4- ii
B、1- iv, 2 -ii, 3-iii, 4- i
C、1- iii, 2 -iv, 3-i, 4- ii
D、1- iii, 2 -ii, 3-i, 4- iv