单项选择题

(As is known) to all, sometimes it is very (difficult) to (tell) the difference between technical English (from) everyday English.

A．As is known
B．difficult
C．tell
D．from
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单项选择题
I (think) I (would enjoy) the movie we went to last night even more (if I had) read the book before (seeing) it.
A．think
B．would enjoy
C．if I had
D．seeing
单项选择题
Every director needs an assistant that he can ______ to take care of problems that may occur in his absence.
A．count on
B．count for
C．count down
D．count out
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