1) The engineers ______ (work) on the new elevator design for several months. a) have worked b) have been working c) worked d) are working 2) The company ______ (install) over 50 elevators this year. a) has installed b) have installed c) installed d) has been installing 3) She ______ (test) the safety features all morning. a) has tested b) tested c) has been testing d) tests 4) They ______ (complete) the project ahead of schedule. a) have completed b) completed c) have been completing d) completes 5) The team ______ (analyze) the data since last week. a) has analyzed b) analyzed c) has been analyzing d) analyzes 6) We ______ (not face) any major issues so far. a) have not faced b) faced c) have been facing d) not faced 7) The elevator ______ (operate) smoothly since its installation. a) has operated b) operated c) has been operating d) operates 8) He ______ (improve) the system for better efficiency. a) has improved b) improved c) has been improving d) improves 9) The technicians ______ (not finish) the maintenance yet. a) have not finished b) finished c) have been finishing d) not finished 10) She ______ (design) elevators for over a decade. a) has designed b) designed c) has been designing d) designs 11) We ______ (upgrade) the software since last month. a) have been upgrading b) upgraded c) have upgraded d) upgrades 12) The new model ______ (receive) positive feedback from users. a) has received b) received c) has been receiving d) receives 13) They ______ (not encounter) any delays during the installation. a) have not encountered b) encountered c) have been encountering d) not encountered 14) The engineers ______ (focus) on improving safety standards. a) have been focusing b) focused c) have focused d) focuses 15) She ______ (lead) the project since it started. a) has been leading b) led c) has led d) leads

Elevator Engineering: Present Perfect vs. Present Perfect Continuous

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