MY FATHER ... TO WORK HARD RECENTLY.A. HELP B. HELPED C. HELPFUL...

6. - 30 BAI TRAC NGHIEM VOI KEYS FOR 9 P
30 BAI TRAC NGHIEM VOI KEYS FOR 9 P

6. My father ... to work hard recently.

A. help B. helped C. helpful D. helpless

A. has able B. is able C. has been able D. have been able