单选题
All employees are ______ to perform their duties in a professional manner at all times.
A、
apparent
B、
alleged
C、
allowed
D、
supposed
【正确答案】
D
【答案解析】
由perform their duties in a professional manner at all times可判断，横线处所填单词应表示“应该…”。答案是(D)supposed。be supposed to do表示“应该做某事，被期望做做某事”。
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