单项选择题

I meant ______ you about it, but I forgot to do so.

A. telling
B. having told
C. to tell
D. to have told
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单项选择题
The ______ problem of bringing a space ship back from the moon has been solved.
A. technical
B. technological
C. technique
D. technology
单项选择题
He ______ have been nervous because he didn't go straight in.
A. ought to
B. must
C. should
D. had to
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