To make sure the bridge and tunnel are structurally sound, they are ..... being constantly checked and serviced.

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To make sure the bridge and tunnel are structurally sound, they are ..... being constantly checked and serviced. (*) mostly (*) momentarily (*) mandatorily (*) mainly

This is a companion discussion topic for the original entry at https://english.best/questions/21803,to-make-sure-the-bridge-and-tunnel-are-structurally-sound-they-are-___-being-constantly-checked-and-serviced/