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21．"What courses are you going to do next semester?"

"I don't know. But it's about time ______ on something."

A．I'd decide        B．I decided        C．I decide        D．I'm deciding

22．______ a ticket for the match, he can now only watch it on TV at home.

A．Obtaining not        B．Not obtaining

C．Not having obtained        D．Not obtained

23．How can I ever concentrate if you ______ continually ______ me with silly questions?

A．have, interrupted        B．had, interrupted

C．a(chǎn)re, interrupting        D．were, interrupted

24．As it turned out to be a small house party, we ______ so formally.

A．need not have dressed up        B．must not have dressed up

C．did not need to dress up        D．must not dress up

25．______ is often the case with a new idea, much preliminary activity and optimistic discussion produced no concrete proposals.

A．That        B．It        C．This        D．As

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