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.