[ Grammar ]
You had better__________with a really good travel agent
A. booking
B. to book
C. with booking
D. book

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Comparison › ViewWhat is the comparative form of “difficult”?
A. more difficult
B. more dificult
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Grammar - Verb Forms › View
Zoe _____________________ this grammar point to me twice, but I still don’t understand it.
A. has already explained
B. has already been explaining
C. already explains
D. have already explain