---I’ll ask the teacher about past tense. I’m very puzzled about it.
--- That is just _____ most of our classmates have doubt.
| A．what | B．why | C．where | D．how |
相关试题
I get the bicycle for _____.My friend
gave it to me when she bought a new one.
| A．everything | B．something | C．nothing | D．anything |
It’s really difficult to ______ what he is trying to express.
| A．leave out | B．break out | C．put  out |
D．make out |
We all felt a sense of ______ when we saw so many overseas Chinese coming back safe and sound from Libya.
| A．security | B．relief | C．emergency | D．achievement |
Scientists say it may be five years ______ it is possible to test this medicine on human patients．
| A．since | B．until | C．before | D．when |
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