单项选择题

______ company executives and union members can reach an agreement, the workers will go on strike.

(A) If
(B) When
(C) Unless
(D) After

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单项选择题

Visitors to the Canadian History Museum should use the side entrance while the front entrance ______.

(A) is renovating
(B) is being renovated
(C) has renovated
(D) has been renovated

单项选择题

Beginning March 31, Western Service will regularly ______ two new bus routes along Hathfield Avenue.

(A) operate
(B) operating
(C) operated
(D) operative

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