Some problems ___ in the lecture by Mr.Smith are very popular in our school, such as the waste of electricity, water and food, etc...
A.referring | B.referred to | C.referring to | D.were referred |
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Some problems ___ in the lecture by Mr.Smith are very popular in our school, such as the waste of electricity, water and food, etc...
A.referring | B.referred to | C.referring to | D.were referred |