_______ what would happen, none of them could find a way out.
A. Left wondering B. Having left wondering
C. Leaving to wonder D. Having left to wonder
—— Where did Mary’s parents buy the beautiful vase?
—— It was in the same village _______ they spent their holidays last year.
A. that B. when C. as D. where
——Is there any possible way to help them get rid of such a bad habit?
——To tell the truth, it’s very hard. But we_______ on this problem.
A. worked B. had worked C. are working D. had been working
Help others whenever you can _______ you will earn respect from others without difficulty.
A. and B. or C. unless D. but
The Internet celebrated its birthday on September 2nd, by which time 40 years _______ since the first successful transfer of data between two computers.
A. has passed B. had passed C. passed D. have passed
—— I haven’t seen Johnson these days.
—— I think she _______ a conference in Beijing, but I’m not sure.
A. should be attending B. might be attending
C. could have attended D. must have attended
