We back in the campsite now if you didn't lose your way.
A. are
B. were
C. will be
D. would be
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no modern equipment and technology, human would not explore space and deep sea.
A. Were
B. Had there been
C. If there are
D. If there have been
If Mr. Zhongpresent, he would have offered any possible medical assistance to the people in need.
A. was
B. had been
C. is
D. has been
the morning bus, he would not have been late for the graduation ceremony.
A. Did he catch
B. Should be caught
C. Has he caught
D. Had he caught
My supervisor was abroad during the months when we were carrying out the project, or he to our help.
A. would have some
B. could come
C. have come
D. had come