单项选择题

Not knowing the language of the country he was visiting, John had a hard time making himself ______.

A．understand
B．understood
C．understanding
D．being understood
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单项选择题
Though Mary continued working, she kept looking at the clock ______, thinking of her sick baby in hospital.
A．all the time
B．at once
C．after a while
D．for a moment
单项选择题
I haven't seen you since you came back from holiday, ______ a nice time
A．Do you have
B．Did you have
C．Have you had
D．Had you had
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