单项选择题
A.whatever
B.whenever
C.wherever
D.whoever
单项选择题 Modem engines make use of exhaust gas driven turbo-chargers to supply pressurized fresh air for （） and supercharging.
单项选择题 Modem engines （） exhaust gas driven turbo-chargers to supply pressurized fresh air for scavenging and supercharging.
单项选择题 Modern engines （） exhaust gas driven turbo-chargers to supply pressurized fresh air for scavenging and supercharging.