19．Don't worry．The drug，if taken according to the directions，will have no side effect．（take）
別擔(dān)心，如果按照說(shuō)明服用，這藥不會(huì)有任何副作用．

分析 別擔(dān)心，如果按照說(shuō)明服用，這藥不會(huì)有任何副作用．

解答 答案：if taken
在時(shí)間、條件、讓步、方式等狀語(yǔ)從句中，當(dāng)從句的主語(yǔ)和主句的主語(yǔ)一致時(shí)（或者從句中含有主語(yǔ)it時(shí)），且從句中含有系動(dòng)詞be，此時(shí)從句的主語(yǔ)和be動(dòng)詞通�？梢砸煌÷裕揪渲械耐暾问綉�(yīng)該是if it is taken according to the directions，由此可知答案為if taken．

點(diǎn)評(píng) 熟悉狀語(yǔ)從句中省略的基本條件，正確確定答案．

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