单选题 Jack would rather spend time complaining than ________ the problem by himself.

单选题 In addition to economic considerations, there are other reasons _______ people work long hours.

单选题 Jack said the construction of the subway would be completed in October, ______ is a great surprise to us.

单选题 ______ arriving at the meeting room, Tina discovered that she had left the sample products in her office.

单选题 The sales manager resigned last Monday after ______ to take a pay cut by the company.

单选题 Not until the day before yesterday _________to give a speech at the meeting.

单选题 I don’t doubt _________the stock market will recover from the economic crisis.

单选题 Not until she arrived at the meeting room ________ she had forgotten to bring the document.

单选题 They regard _________as their duty to provide the best service for their customers.