His parents are convinced ____ the fact the their son always focuses his mind __

His parents are convinced ____ the fact the their son always focuses his mind __

题型:不详难度:来源:
His parents are convinced ____ the fact the their son always focuses his mind ___ his study.
A.of; onB.of; atC.by; toD.on; at

答案
A
解析
本题考查介词。 be convinced of确信,focus one’s mind on集中某人的注意力,根据句意选A。
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