Some problems ___ in the lecture by Mr.Smith are very popular in our school, such as the waste of electricity, water and food, etc...
#74324
A
referring
B
referred to
C
referring to
D
were referred
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The doctor tried his best to save this patient.At last he began ___.
#80870
A
to come
B
to come to life
C
to come up
D
to come up to