问题
选择题
.Your son has kept _________ for two hours. You’d better ask him to have a rest.
A.study
B.studied
C.to study
D. studying
答案
答案:D
keep doing 保持不间断地做某事
keep to do keep要求 -ing, 没有 to do 形式
故选D.
.Your son has kept _________ for two hours. You’d better ask him to have a rest.
A.study
B.studied
C.to study
D. studying
答案:D
keep doing 保持不间断地做某事
keep to do keep要求 -ing, 没有 to do 形式
故选D.