[ Tenses ]
We are trying our best to solve the problem.
A. Present Simple Tense
B. Present Continuous Tense
C. Simple Past Tense
D. Past Continuous Tense

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Grammar › ViewI must go now. I promised _________________ late.
A. not being
B. to not be
C. not to be
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He hasn’t been to London _____ his last birthday.
A. during
B. for
C. since