单项选择题

Only when (he realized) that there (would be) more (difficulties) ahead than he expected (he came to) me for help.

A. he realized
B. would be
C. difficulties
D. he came to
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(The) great American supermarket is a wonderful place with (the) great variety of (healthy food) and (other commodities).
A. The
B. the
C. healthy food
D. other commodities
单项选择题
______ being fun and good exercise, swimming is a very useful skill.
A．Rather than
B．Apart from
C．Instead of
D．Owing to
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