单项选择题

The new CEO's unconventional approach to the job ______ some members of the board of directors.

(A) concern
(B) concerns
(C) concerning
(D) is concerned

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单项选择题

______ next month, employees will have to log in on the company intranet when they arrive at work.

(A) Starting
(B) Having
(C) Taking
(D) Doing

单项选择题

Although some bus drivers have signed the collective pay agreement, there are many ______ are refusing to do so.

(A) what
(B) which
(C) who
(D) when

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