the sentence that uses past progressive tense is optino C
c. melanie was riding her bicycle all afternoon.
Option a is a modal verb that expresses possibility in the past
Option b is present perfect continuous
Option d is a modal verb that expresses advice in the past
.com=commercial
.edu=education
.netv=network
.gov=government
Well, you don't exactly comment per se. You click "answer" or go to someone else's answer and click reply (not sure the exact labelling but it's something along those lines).
Edit: It says "add your comment to this answer here", not "reply."
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Answer:
b Young drivers must remember to fully narrow in their focus when they get behind the wheel.
Explanation: