[ Tenses ]
I can’t solve that thorny problem until my brother … it to me.
A. explain
B. will explain
C. has explained
D. will be explaining
Select your answer:

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Present vs. Past Participle › ViewThe students found the question …
- confusing
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My phone is out of order, _____ i s a real nuisance.
A. when
B. what
C. which
D. where
