Test analysis: examine the fixed collocation. The main sentence of this topic is.

time

be

at present

Is considered to be _ _ _ _ _

great

Value. , doctor

Wang (surname)

have

loyal

_____

this

defective

exist

this

pass

five

Years is an attributive clause, omitting which/that. The time that Dr. Wang spent on disabled people in the past five years now seems very meaningful. be committed to

(possessive case of one) personal

time

arrive

do

Something takes time to do something; think ...

arrive

be

What does something think of ... So choose C.