I shan't be able to come

[noorul]

Test No. incompl/advan-78 "GMAT Verbal Quiz", question 2

I'm afraid I shan't be ......... to come on Tuesday because of a prior engagement.

(a) capable
(b) able
(c) can
(d) possible

Test No. incompl/advan-78 "GMAT Verbal Quiz", answer 2

I'm afraid I shan't be able to come on Tuesday because of a prior engagement.

Correct answer: (b) able
_________________________

what is the answer?

[Torsten]

[Ling]

Dear sir:
Would you please to explain me more about the sentence?

Thanks in advance for your help

[Torsten]

This means the speaker can't come to the meeting because she has another appointment.
_________________
Test Of English for International Communication
TOEIC Preparation & TOEIC Vocabulary