语法与词汇
Penicillin acts both ________.
A、
killing bacteria and their growth being inhibited
B、
to kill bacteria and to inhibit their growth
C、
by killing bacteria and by inhibiting their growth
D、
kills bacteria and inhibits their growth
【正确答案】
C
【答案解析】
句意：青霉素通过杀死细菌和抑制其生长而起作用。被动句中表“通过”用 by+doing的形式。因此，本题的正确答案是C。
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