单选题 Employees wishing to ______ professional congresses or seminars will continue to receive their pay during the time they are absent.

【正确答案】 B

【答案解析】(A)应与介词ill连用构成enroll in(登记，招收)；(C)也应与介词in连用构成participate in(参加，参与)；(D)可直接后接宾语，但不符合句意。“想参加专业会议或研讨会的…”的句意最恰当，故选(B)attend(参加)。